User 6 logged into their account 3 times but only once in 2020, so we include this login in the result table. User 8 logged into their account 2 times in 2020, once in February and once in December.

Bitcoin’s creator has hidden behind the pseudonym Satoshi Nakamoto for 17 years. But a trail of clues buried deep in crypto lore led to a 55-year-old computer scientist named Adam Back.

-- Find all employees who earn more than the average salary of the entire company.

Quantum computers are already here, but they make far too many errors. This is arguably the biggest obstacle to the technology really becoming useful, but recent breakthroughs suggest a solution may ...

Some readers may solve the problem procedurally: line up the two numbers, add the ones column, carry the one, and add the tens to get 43. Others might instead notice a creative shortcut: 29 + 14 is ...