1: A coffin.

2: Maybe the name of the horse is Friday?

3: "Will you take me to your tribe?". Funny one.

4: The surgeon is his mother.

5: I'm assuming that there was some secondary form of global illumination. Sunlight, because it's during the day?

6: The cork will always float towards the highest point of the water, so fill the glass completely so it gets a slightly rounded shape in the top (convex, I think), and it should float up into the middle.

7: Take the juice from the 2nd glass and put it into the 5th one. It can't be THAT easy, can it?

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram