The more of this there is, the less you see. What is it?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What has 88 keys?

What is full of holes but still holds water?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

During which month do people sleep the least?

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

What word does this rebus represent?

meta meta
meta meta

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?