In your opinion what are three most important unanswered scientific, medical, and/or technological questions?

Question

In your opinion what are three most important unanswered scientific, medical, and/or technological questions?

Answer 1

making  plastic  biodegradable!!!!!!!!!

Answer 2

how do cell communicate with other cells, how do cell process information and how do cells store information

Answer 3

In my opinion, the three would be:

1. Is there really a "missing link"?

2. Are there lifeforms in other planets? and

3. Why did several ancient civilizations build numerous megastructures?

Answer 4

I think some important answers we need are:

- the cure for cancer and AIDS (all diseases actually)

- a sustainable and environmentally-friendly energy source

- how to enable third-world countries to look after their people

I don't know whether they fit under your headings, but I think they're stuff we really need to sort out if this world is going to be a better place. I'm sure I could think of heaps more if I gave it more time, but I didn't want to overwhelm you with a list of hundreds!