What's the next in the series?

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

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

Can you count the number of triangles in the given picture?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Find the next number in the sequence

5 12 24 36 ?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?