Human blood vessels

We learned today that there are approx 100,000km of blood vessels in an average human adult's body! Here's the question: If you laid all those blood vessels end-to-end, how many times would they go around the Equator?

Pasteurization

What is pasteurisation of milk?
Where did the name come from?

Maglev Trains

There is a train in Japan called the Maglev which runs on Magnetic Energy. Can anyone find out how it works?

Greenwich Meantime

We were learning about time zones in Maths and Anselm asked "Who was the first to invent time zones and who decided that Greenwich, London should be 0 degrees Longitude?"

Most popular religion?

We were talking about world religions today and Ciara asked which church has more members, Catholic or Protestant? I'm also asking which is the most popular religion in the world

Einstein's Theory of Relativity explained

Yet Another Science Question!

Andrew did an experiment using yeast, sugar and boiling water in a plastic bottle. We placed a balloon on top of the bottle and the balloon was supposed to inflate after one hour, but it didn't and we are wondering why not? (Andrew did the experiment once before and it did inflate that time).