When does life stop and living begin?

Friday, January 12, 2007, 7:51 am, a man stood at a metro station in Washington DC and started to play the violin; it was a cold morning. He played six Bach pieces for about 45 minutes. During that time, since it was rush hour, it was calculated that about one...

The Beauty of Mathematics

1 x 8 + 1 = 9 12 x 8 + 2 = 98 123 x 8 + 3 = 987 1234 x 8 + 4 = 9876 12345 x 8 + 5 = 98765 123456 x 8 + 6 = 987654 1234567 x 8 + 7 = 9876543 12345678 x 8 + 8 = 98765432 123456789 x 8 + 9 = 987654321 1 x 9 + 2 = 11 12 x 9 + 3 = 111 123 x 9 + 4 = 1111 1234 x 9 + 5 =...