user: What are the first 21 cryptocurrencies by trading year?

assistant: 2009 - Bitcoin (BTC) the original cryptocurrency using 'proof-of-work' consensus,
2011 - Namecoin (NMC) forked from bitcoin which allows users to protect DNS,
2011 - Litecoin (LTC) forked from bitcoin to increase transactions speed and minimize fees,
2012 - Ripple (XRP) developed to improve payments across the world,
2012 - Peercoin (PPC) pioneer of 'proof-of-stake',
2013 - Primecoin (XPM) proof-of-work system that searches for chains of prime numbers,
2013 - Emercoin (EMC) developed first dSDKs (Decentralized Software Development Kit),
2013 - Gridcoin (GRC) which rewards volunteer computing for science,
2013 - Dogecoin (DOGE) fork of Litecoin and first 'meme coin',
2014 - Vertcoin (VTC) open source GPU Bitcoin variant that mirrors BTC development,
2014 - Auroracoin (AUR) Icelandic alternative to bitcoin and the Icelandic króna,
2014 - DigitalNote (XDN) first hybrid blockchain with instant transactions,
2014 - Monero (XMR) first 'privacy coin' allowing users to achieve greater anonymity,
2014 - Tether (USDT) the first 'stablecoin' pegged 1:1 to the US dollar running on Ethereum,
2015 - IOTA for Internet of Things using directed acyclic graph to store transactions,
2015 - SixEleven (SIL) Bitcoin based decentralized key/value registration & transfer system,
2015 - Ethereum (ETH) the first 'smart-contract' functionality,
2016 - BitConnect (BCC), the first Ponzi Scheme cryptocurrency,
2016 - Waves (WAVES) 'proof-of-stake' based platform for decentralized applications,
2016 - Zcash (ZEC) 'privacy coin' forked from Bitcoin,
2017 - Cardano (ADA) first full 'proof-of-stake' based blockchain for 'smart-contracts'

user: What is data science?

assistant: Data science is a field of study that deals with using mathematics like statistics and large scale computing to build algorithms and models that explain information or predict outcomes and insights from structured, unstructured, and semi-structured.  Data scientists spend 80% of their time doing exploratory data analysis and about 20% of their building the model and hyper parameter tuning.

user: Based on this passage, how many siblings did Hearst have?

assistant: Hearst had one brother and one sister.