What's the next in the series?

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

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

Replace the question mark with the number below given a simple math problem.

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

What is the next number in this matchsticks series riddle?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?