1. Tornadoes occur most frequently in the United States. Which country comes second?

2. Which was the world's first commercial jet airliner?

3. In 1858, who became the first female fellow of the Statistical Society of London?

4. In poker, if you have 'the nuts', what are you holding?

5. Which now common practice (among nations) was once shunned as the 'sin of David'?

For the answers, please visit: ten things i didn't know until last week.