When I was learning multiplication, my father showed me the “rule of 9.” Multiply any number by 9, he said, and then add together the digits of the product, and you will always land on 9. 9 × 2 = 18 → ...

Could life exist beyond Earth? This documentary investigates the solar system’s most promising candidates for alien life, from the frozen oceans of Europa to the red deserts of Mars... Georgia ...