What happened when the wheel was invented?

What's the next in the series?

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

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

What do you answer even though it never asks you questions?

What does below Rebus say?

XLR8

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Can it be possible to build a house that has all its four walls facing towards the South?