Chapter 1: Environment and empires
Ferdinand von Richthofen and first uses of “silk road”:
Ferdinand
von Richthofen, “
Über die zentralasiatischen Seidenstrassen bis zum 2. Jh. n. Chr.”
Verhandlungen der Gesellschaft für Erdkunde zu Berlin
(
1877), 96–122;
Close
Daniel
C. Waugh, “
From the Editor's Desktop: Richthofen's ‘Silk Roads’: Toward the Archaeology of a Concept,”
The Silk Road
(online publication of the Silk Road Foundation) vol. 5, no. 1 (Summer
2007), 1–10.
Close
http://silkroadfoundation.org/newsletter/vol5num1/“The places in between”:
Rory
Stewart,
The Places in Between
(Orlando, FL: Harcourt, Inc.,
2006).
Close
Ecological zones of Central Eurasia:
Denis
Sinor, ed., “The Geographic Setting,” in
The Cambridge History of Early Inner Asia
(Cambridge: Cambridge University Press,
1990), 19–38.
Close
Ibn Khaldun's theory:
Ibn
Khaldun,
The Muqaddimah: An Introduction to History
, trans. and introduction by Franz Rosenthal; abridged and edited by N. J. Dawood (Princeton, NJ: Princeton University Press,
2005).
Close
Gibbon's comments on character of Scythians and Tatars is in chap. 26 of his work:
Edward
Gibbon,
The History of the Decline and Fall of the Roman Empire
, ed. David Womersley (London: Penguin,
1995), vol. 2, 1025–26.
Close
Also available at
http://www.gutenberg.org/files/732/732-h/732-h.htm.
On the socio-political organization of pastoral nomadic peoples:
Joseph
Fletcher, “The Mongols: Ecological and Social
(page 123)p. 123
Perspectives,”
Harvard Journal of Asiatic Studies
46:1 (June
1986): 11–50.
Close
Sima Qian on the Xiongnu:
Sima Qian, “The Account of the Xiongnu,”
Records of the Grand Historian
(Shiji ch. 110), Han dynasty, vol. 2, trans.
Burton
Watson (New York: Columbia University Press,
1993), 129.
Close
Ammianus Marcellinus on the Huns:
Ammianus
Marcellinus,
The Later Roman Empire (354–378)
, 31.2, ed. and trans. Walter Hamilton (Harmondsworth, UK: Penguin,
1986), 411–12.
Close
Nicola Di Cosmo's argument regarding the Great Wall and nomad-type states:
Nicola
Di Cosmo,
Ancient China and Its Enemies: The Rise of Nomadic Power in East Asian History
(Cambridge: Cambridge University Press,
2002);
Close
Nicola
Di Cosmo, “
State Formation and Periodization in Inner Asian History,”
Journal of World History
10, no. 1 (
1999): 1–40;
Close
“the first cry” quoted from 23.
(page 124)p. 124Chapter 3: The biological silk road
Long-term trans-Eurasian exchange:
Andrew Sherratt, “The Trans-Eurasian Exchange: The Pre-history of Chinese Relations with the West,” in
Contact and Exchange in the Ancient World
, ed.
Victor
H. Mair (Honolulu: University of Hawai’i Press,
2006), 30–61.
Close
William of Rubruck on “cosmos” (kumis):
The
Journey of William of Rubruck to the Eastern Parts of the World, 1253–55, as narrated by himself, with two accounts of the earlier journey of John of Pian de Carpine, trans. and ed. with an introductory notice by William Woodville Rockhill (London: Hakluyt Society,
1900);
introduction and further annotation by Daniel Waugh, Silk Road Seattle,
http://depts.washington.edu/silkroad/texts/rubruck.html. Quoted passage is from section V, “Kumiss,” in Waugh's online version of the text.
Lactose intolerance/lactase persistence and Central Eurasians: “Got Lactase?” (2007),
Understanding Evolution website,
http://evolution.berkeley.edu/evolibrary/news/070401_lactose;
Catherine
J. E. Ingram, Charlotte A. Mulcare, Yuval Itan, Mark G. Thomas, and Dallas M. Swallow, “
Lactose digestion and the Evolutionary Genetics of Lactase Persistence,”
Human Genetics
124, no. 6 (Jan.
2009): 579–91;
Close
Wang
YG, Yan YS, Xu JJ, Du RF, S. D. Flatz, W. Kühnau, and G. Flatz, “
Prevalence of Primary Adult Lactose Malabsorption in Three Populations of Northern China,”
Human Genetics
67, no. 1 (
1984): 103–6.
Close
Interbreeding of
Homo sapiens and Neanderthals: Ker Than, “Neanderthals, Humans Interbred—First Solid DNA Evidence,” published by the National Geographic Society,
http://news.nationalgeographic.com/news/2010/05/100506-science-neanderthals-humans-mated-interbred-dna-gene/;
R.
E. Green, J. Krause, A. W. Briggs, et al., “
A Draft Sequence of the Neandertal Genome,”
Science
328, no. 5979 (May
2010): 710–22,
Close
http://www.eva.mpg.de/neandertal/press/presskit-neandertal/pdf/Science_Green.pdf.
DNA studies of silk road migrations:
C.
Lalueza-Fox, M. L. Sampietro, M. T. P. Gilbert, L. Castri, F. Facchini, D. Pettener, J. Bertranpetit, “
Unravelling Migrations in the Steppe: Mitochondrial DNA Sequences from Ancient Central Asians,” in
Proceedings: Biological Sciences
, vol. 271, no. 1542 (May 7,
2004): 941–47,
Close
published by The Royal Society,
http://www.jstor.org/stable/4142653; Peter Forster, “Ice Ages and the Mitochondrial DNA Chronology of Human Dispersals: A Review,” in “The Evolutionary Legacy of
(page 125)p. 125
the Ice Ages (Feb. 29, 2004): 255–64, special issue,
http://www.jstor.org/stable/4142177,
Philosophical Transactions: Biological Sciences, 359, no. 1442.
Mongol genetic marker on the Y chromosome:
Tatiana
Zerjal, Xue Yali; Giorgio Bertorelle, R. Spencer Wells; Bao Weidong; Zhu Suling, Raheel Qamar, Qasim Ayub, Aisha Mohyuddin, Fu Songbin, Li Pu, Nadira Yuldasheva, Ruslan Ruzibakiev, Xu Jiujin, Shu Quangfang, Du Ruofu, Yang Huangming, Matthew E. Hurles, and Elizabeth Robinson, “
The Genetic Legacy of the Mongols,”
American Journal of Human Genetics
72, no. 3 (Mar.
2003): 717–22.
Close
Mongols and plague:
William
H. McNeill, “The Impact of the Mongol Empire on Shifting Disease Balances, 1200–1500,” in
Plagues and Peoples
(New York: Anchor Books, 1976,
1998), 132–75;
Close
George
D. Sussman, “
Was the Black Death in India and China?”
Bulletin of the History of Medicine
85, no. 3 (Fall
2011): 319–55;
Close
Nicholas
Wade, “Europe's Plagues Came from China, Study Finds,”
New York Times
, Nov. 1,
2010, A10,
http://www.nytimes.com/2010/11/01/health/01plague.html;
Giovanna
Morelli et al., “
Yersina Pestis Genome Sequencing Identifies Patterns of Global Phylogenetic Diversity,”
Nature Genetics
42 (
2010): 1140–43,
Close
http://www.nature.com/ng/journal/v42/n12/full/ng.705.html.
Horse domestication:
David
W. Anthony,
The Horse, The Wheel, and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the Modern World
(Princeton, NJ: Princeton University Press,
2007).
Close
Zhang Qian on blood-sweating horses: Sima Qian,
Shiji (Records of the Historian), ch. 123, “Dayuan liezhuan”; translation in
Sima Qian, “The Account of Dayuan,”
Records of the Grand Historian
(ch. 123), Han dynasty, vol. 2, trans.
Burton
Watson (New York: Columbia University Press,
1993), 231–53.
Close
Polo match in the
Shahnamah:
Ferdawsi
,
The Epic of the Kings: Shah-Nama, the National Epic of Persia
, trans. Reuben Levy (London: Routledge and Kegan Paul,
1967), 97–98.
Close
Schumpeter's theory of imperialism:
Joseph
A. Schumpeter, “The Sociology of Imperialisms,” in
Imperialism and Social Classes: Two Essays
(New York: World Publishing,
1972), especially 141–42.
Close
Alcoholic beverages in ancient Egypt and Mesopotamia: “Beer” (vol. 1), “Wine” and “Intoxication” (vol. 2), in
The Oxford Encyclopedia of Ancient Egypt
, ed.
Donald
B. Redforth (New York: Oxford University Press,
2001);
Close
Alexander
H. Joffe, “
Alcohol and Social Complexity in Ancient Western Asia,”
Current (page 126)p. 126
Anthropology 39, no. 3 (June
1998): 297–322;
Close
Patrick
E. McGovern,
Ancient Wine: The Search for the Origins of Viniculture
(Princeton, NJ: Princeton University Press,
2003);
Close
John
Varriano,
Wine: A Cultural History
(London: Reaktion,
2010).
Close
Herodotus on wine among Persians and Scythians:
Herodotus
,
The Histories
, trans. Aubrey de Sélincourt (Harmondsworth, UK: Penguin,
1972), 1:133
Close
on Persian deliberations and 4:70 on Scythians drinking wine with blood.
Strabo on wine in Central Eurasia:
Strabo
,
The Geography of Strabo
, ed. and trans. H. L. Jones (Cambridge, MA: Harvard University Press,
1924), 11:10.
Close
Grapes and wine in China:
Li
Zhengping,
Chinese Wine
(Cambridge: Cambridge University Press,
2010);
Close
E.
H. Schafer,
The Golden Peaches of Samarkand: A Study of T’ang Exotics
(Berkeley: University of California Press,
1963), 141–45;
Close
Lü Guang in Kucha:
Valerie
Hansen,
The Silk Road: A New History
(Oxford: Oxford University Press,
2012), 68;
Close
Li Fang,
Taiping yulan, 125:604 as cited in
Shiliuguo chunqiu and in Éric Trombert,
On Ikeda, and
Guangda
Zhang,
Les manuscrits chinois de Koutcha: Fonds Pelliot de la Bibliothèque Nationale de France (Paris: Institut des hautes études chinoises du Collège de France,
2000), 11.
Xuanzang … at the Western Turk Yabghu's camp: Huili, Datang daciensi Sanzang fashi chuan, j. 2. Taisho Tripitaka vol. 50, no. 2053 (CBETA Chinese Electronic Tripitaka V1.29, Normalized Version, T50n2053_p0227b14-T50n2053_p0227b15).
“Fine grape wine, a jade cup gleaming in the moonlight”: My translation of Wang Han's
Liangzhou ci, cf.
Stephen
Owen,
The Poetry of the Early T’ang
(New Haven: Yale University Press,
1977).
Close
“Wine-ode” of Ibn al-Fārid: Ibn al-Farid, trans. and intro. by
Th.
Emil Homerin, Michael A. Sells, preface,
‘Umar Ibn al-Farid: Sufi Verse, Saintly Life
(New York: Paulist Press,
2001), 47–51.
Close
(page 127)p. 127Hafiz, “Hair disheveled”: I have used the translation of
ghazal 26 (Qazvini-Ghani enumeration) by
Reza
Saberi, in
Poems of Hafez
(Lanham, MD: University Press of America,
1995), 20–21;
Close
for clarity, I made one slight change in the translation with reference to the nineteenth-century translation by H. Wilberforce Clarke (who numbers this
ghazal 44), replacing Saberi's “narcissus” with “eye” as used by Clarke and other translators.
Silver drinks fountain in the Mongol court:
The Journey of
William
of Rubruck to the Eastern parts of the World, 1253–55, as narrated by himself, with two accounts of the earlier journey of John of Pian de Carpine, trans. from the Latin and ed., with an introductory note by William Woodville Rockhill (London: Hakluyt Society,
1900);
introduction and further annotation by Daniel Waugh, Silk Road Seattle, sec. 15,
http://depts.washington.edu/silkroad/texts/rubruck.html.
Trans-Eurasian crop exchanges:
Thomas
T. Allsen,
Culture and Conquest in Mongol Eurasia
(Cambridge: Cambridge University Press,
2001);
Close
Berthold
Laufer,
Sino-Iranica: C
hinese Contributions to the History of Civilization in Ancient Iran, with Special Reference to the History of Cultivated Plants and Products (New York: Klaus Reprint Corp.,
1967; Taipei: Cheng-wen, 1967);
Joseph
Needham and Francesca Bray,
Science and Civilization in China
, vol. 6, pt. 2 (Cambridge: Cambridge University Press,
1984);
Close
J.
Smartt and N. W. Simmonds,
Evolution of Crop Plants
. 2nd ed. (Essex, UK: Longman Scientific and Technical,
1995);
Close
J.
G. Vaughan and C. A. Geissler,
The New Oxford Book of Food Plants
(Oxford: Oxford University Press,
1997).
Close
Dumplings:
Holly Chase, “The Meyhane or McDonalds? Changes in Eating Habits and the Evolution of Fast Food in Istanbul,” in
A Taste of Thyme: Culinary Cultures of the Middle East
, 2nd ed., ed.
Sami
Zubaida and Richard Tapper (London: Tauris Parke,
2000), 81;
Close
Josh Wilson with Andrei Nesterov, “Pelmeni: A Tasty History,” Newsletter of SRAS (School of Russian and Asian Studies) Jan. 10, 2010,
http://www.sras.org/news2.php?m=287.
Chapter 4: The technological silk road
The chair and cane sugar:
John
Kieschnick,
The Impact of Buddhism on Chinese Material Culture
(Princeton, NJ: Princeton University Press,
2003), chap. 4.
Close
“Trans-ecological” and “trans-civilizational” trade:
David
Christian,
(page 128)p. 128
“Silk Roads of Steppe Roads? The Silk Roads in World History,” in
Realms of the Silk Roads: Ancient and Modern
, Silk Road Studies 4, ed. David Christian and Craig Benjamin (Turnhout, Belgium: Brepols,
2000), 67–94.
Close
Classical references to silk: Virgil,
Georgics 2:120–120; Strabo,
Geography 15.1.21; Pliny the Elder,
Natural History 6.20, trans. from Pliny the Elder;
The Natural History of Pliny
, trans.
John
Bostock and H. T. Riley (London: H. G. Bohn,
1855–57);
Close
Lucan,
Pharsalia, 10.141,
The Periplus of the Erythraean Sea: Travel and Trade in the Indian Ocean by a Merchant of the First Century
, trans.
William
H. Schoff (New York: Longmans, Green,
1912), 265;
Close
Seneca,
De Beneficiis 7.9, trans. from
Southern Literary Messenger 2, no. 1 (Dec. 1835): 355. All classical texts and some translations available online at
http://www.perseus.tufts.edu.
“Sons of poor families”: Sima Qian,
Shiji, bk. 123,
“Dayuan liezhuan,” trans. Burton Watson,
Records of the Grand Historian
, rev. ed.,
Han
dynasty. vol. 2 (New York: Columbia University Press,
1993), 242.
Close
Mughal trade of textiles for horses:
Scott
Levi, “
India, Russia and the Eighteenth-Century Transformation of the Central Asian Caravan Trade,”
Journal of the Economic and Social History of the Orient
42 no. 4 (
1999): 519–48.
Close
Paper and printing in China and Islamic world:
Jonathan
M. Bloom,
Paper before Print: The History and Impact of Paper in the Islamic World (New Haven, CT: Yale University Press,
2001);
Jonathan
M. Bloom, “
Silk Road or Paper Road?”
The Silkroad Foundation Newsletter
3, no. 2 (Dec.
2005),
Close
http://www.silk-road.com/newsletter/vol3num2/5_bloom.php.
Chinese background for the European invention of typography: Tsien Tsuen-Hsuin in
Science and Civilisation in China, ed.
Joseph
Needham and Tsien Tsuen-Hsuin, vol. 5, pt. 1,
Paper and Printing
(Cambridge: Cambridge University Press,
1985).
Close
Eurasian medical tradition and humoral theory:
Thomas
Allsen,
Culture and Conquest in Mongol Eurasia
, chap. 16, “Medicine” (Cambridge: Cambridge University Press,
2001), 141–61;
Close
E.
N. Anderson,
The Food of China
(New Haven, CT: Yale University Press,
1990);
Close
Mary
Hardy, Ian Coulter, Swamy Venuturupalli, Elizabeth A. Roth, Joya Favreau, Sally C. Morton, and Paul Shekelle, “Appendix A. Ayurveda's History, Beliefs and Practices,” in “Ayurvedic Interventions for Diabetes Mellitus: A Systematic Review,” Report No. 01-E040,
Evidence Reports/Technology (page 129)p. 129
Assessments, no. 41 (Rockville, MD: Agency for Healthcare Research and Quality, Sept.
2001),
http://www.ncbi.nlm.nih.gov/books/NBK33781;
Paul
U. Unschuld,
Medicine in China: A History of Ideas
(Berkeley: University of California Press,
1985).
Close
Donkey meat: “Donkey meat: the most traditional way to get a piece of ass,” People's Daily Online, Mar. 30, 2010, http://english.peopledaily.com.cn/90001/90782/6935139.html.
Smallpox:
Joseph
Needham,
Science and Civilisation in China, vol. 6, pt. 6, sec. 44, “Medicine” (Cambridge: Cambridge University Press,
1984), 127–53;
William
J. Broad and Judith Miller, “
Report Provides New Details of Soviet Smallpox Accident,”
New York Times
, June 15,
2002.
Close
Nuclear weapons:
Sergei Goncharenko, “Sino-Soviet Military Cooperation,” in
Brothers in Arms: The Rise and Fall of the Sino-Soviet Alliance, 1945–1963
, ed.
Odd
Arne Westad (Washington, DC: Woodrow Wilson Center Press; Stanford, CA: Stanford University Press,
1998).
Close
Gunpowder:
Robert
K. G. Temple,
The Genius of China: 3,000 Years of Science, Discovery and Invention
(New York: Simon & Schuster,
1986), 224–48.
Close
The chariot:
David
W. Anthony,
The Horse, The Wheel, and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the Modern World
(Princeton, NJ: Princeton University Press,
2007), 397–411 and 460–63;
Close
Edward
L. Shaughnessy, “Historical Perspectives on the Introduction of the Chariot into China”
Harvard Journal of Asiatic Studies
48, no. 1 (Jun.
1988): 189–237.
Close
Chapter 5: The arts on the silk road
Eurasian story exchanges:
Richard
Francis Burton, trans., “The Tale of the Husband and the Parrot,” in
The Book of The Thousand Nights and a Night
, 6 vols. (New York: Heritage Press,
1934), vol. 1;
Close
Walter
Cohen, “
Eurasian Fiction,”
Global South
1, nos. 1 and 2 (
2007): 100–119;
Close
E.
B. Cowell, ed.,
The Jātaka: Or Stories of the Buddha's Former Births
, trans. from the Pāli by various hands, 6 vols. (Cambridge: Cambridge University Press,
1895–1907; repr., London: Routledge and Kegan Paul, 1973).
Close
I refer to the following stories from the
Jātaka: vol. 1 #189, #294, #145; vol. 2 #198, #208, #294.
James
Huntley Grayson, “
Rabbit Visits the Dragon Palace: A Korea-Adapted, Buddhist Tale from India,”
Fabula
45, no. 1/2 (Berlin:
2004); 69–93;
Close
Heading essay on
Jakata tales in
Sarah
(page 130)p. 130
Lawall, ed.,
The Norton Anthology of World Literature
(New York: W. W. Norton,
2002), vol. A.;
Close
Victor
H. Mair,
Tun-huang Popular Narratives
(Cambridge: Cambridge University Press,
1983);
Close
The Norton Anthology of Literature (online), Discovery Module 14, “The sharing of narrative materials in the Middle Ages,”
http://www.wwnorton.com/college/english/worldlit2e/full/discovery_modules/dm14_1.htm;
Visnu
Sarma,
The Pancatantra
, trans. with an intro. by Chandra Rajan (London: Penguin,
1993).
Close
Lutes: Stephen Blum, “Central Asia,” in
Grove Music Online.
Oxford Music Online,
http://0-www.oxfordmusiconline.com.library.lausys.georgetown.edu/subscriber/article/grove/music/05284; Jean During, “Barbat” in
Encyclopaedia Iranica (1988),
http://www.iranica.com/articles/barbat. J.-Cl. Chabrier, A. Dietrich, C. E. Bosworth, H. G. Farmer, “ʿ’Ūd,”
Encyclopaedia of Islam, 2nd ed. (Brill, 2011),
http://www.brillonline.nl/subscriber/entry?entry=islam_COM-1270; print version: vol. 10, 767, col. 2;
H.
G. Farmer, “Ud,” in
New Grove Dictionary of Music and Musicians
, Oxford: Oxford University Press,
1980;
Close
C.
Marcel-Dubois,
Les instruments de musique de l’Inde ancienne
(Presses universitaires de France,
1941), 89, 205;
Close
T.
S. Vyzgo,
Muzykal’nye instrumenty Sredneĭ Azii
(Musical Instruments of Central Asia) (Moscow,
1980);
Close
O.
Wright, “Mūsīkī, later Mūsīḳā,”
Encyclopaedia of Islam
, 2nd ed. (Leiden: Brill,
2011),
Close
http://www.brillonline.nl/subscriber/entry?entry=islam_COM-0812; print version: vol. 7, 681, col. 1.
Halos: E. H. Ramsden, “The Halo: A Further Enquiry into Its Origin,” Burlington Magazine for Connoisseurs 78, no. 457 (Apr. 1941): 123–27, 131.
The three hares: “The Three Hares Project,” http://www.chrischapmanphotography.co.uk/hares/index.html; “The Travels of the Three Rabbits: Shared Iconography Across the Silk Road,” IDP News, no. 18 (International Dunhuang Project, Summer 2001), http://idp.bl.uk/archives/news18/idpnews_18.a4d.
Chapter 6: Whither the silk road?
Early modern continuation of the silk road:
James
A. Millward,
Eurasian Crossroads: A History of Xinjiang
(New York: Columbia University Press,
2008), 72–76;
Close
Scott
Levi, “
India, Russia and the Eighteenth-Century Transformation of the Central Asian Caravan Trade,”
Journal of the Economic and Social History of the Orient
42, no. 4 (
1999): 519–48.
Close
Kazakh-Qing silk trade in eighteenth and nineteenth centuries: The documents referenced are in the No. One Historical Archive in Beijing; discussion in
James
Millward,
Beyond the Pass: Economy, Ethnicity and Empire in Qing Central Asia, 1759–1864
(Stanford, CA: Stanford University Press,
1998), 45–48.
Close
Zhang Yin's Jiulong company: “China's richest woman: from waste to wealth,” Xinhua via China Daily, Oct. 20, 2006, http://www.chinadaily.com.cn/china/2006-10/20/content_713250.htm.
Hillary Clinton's silk road initiative: “Secretary of State Hillary Rodham Clinton on India and the United States: A Vision for the 21st Century,” July 20, 2011, Anna Centenary Library, Chennai, India, http://iipdigital.usembassy.gov/st/english/texttrans/2011/07/20110720165044su0.7134014.html#axzz1SiHYG012.
Iranian, Pakistani, and Chinese political use of the “silk road” idea: “Iran, China Urge Stronger Ties.” PressTV, Aug. 20, 2011, http://www.presstv.ir/detail/194884.html; “Sino-pak Ties: ‘Silk Road Will Be Fully Revived,” Express Tribune, Sept. 3, 2011, (page 132)p. 132
http://tribune.com.pk/story/243971/sino-pak-ties-silk-road-will-be-fully-revived/; Li Xiguang, “Fuxing sichou zhi lu, dapo meiguo weidu” (Revive the silk road, smash American containment), Huanqiu shibao, Nov. 28, 2011, http://opinion.huanqiu.com/roll/2011-11/2214092.html.
“Silk-road inspired regional American cuisine”: from the website of the restaurant Mie N Yu, http://www.mienyu.com/information.cfm.
Silk road in fashion: Hilary Alexander, “Oscar de la Renta autumn/winter 2011 at New York Fashion Week.” Telegraph, Feb. 16, 2011, http://fashion.telegraph.co.uk/columns/hilary-alexander/TMG8329386/Oscar-de-la-Renta-autumnwinter-2011-at-New-York-Fashion-Week.html; “Le Metier de Beauté Fall/Winter 2011 Collection: Silk Road,” Temptalia Beauty Blog, http://www.temptalia.com/le-metier-de-beaute-fallwinter-2011-collection-silk-road.
Online silk road marketplace: Adrian Chen, “The Underground Website Where You Can Buy Any Drug Imaginable,” Gawker, June 6, 2011, http://gawker.com/5805928/the-underground-website-where-you-can-buy-any-drug-imaginable.