What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Can you find the thief by just looking at the picture below?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

When does a USA Potato change its nationality?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?