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Physics, Astronomy & Cosmology / What is the difference between astronomy and cosmology?

« on: 20/01/2019 12:18:57 »

Hi,
What is the difference between astronomy and cosmology?

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Plant Sciences, Zoology & Evolution / Do ants get lost?

« on: 09/01/2019 09:38:53 »

What happens to an ant that I blow off my 3rd floor balcony into the garden?  Does it simply join another colony?

3

Physics, Astronomy & Cosmology / Why do plastic fridge magnets not repel each other?

« on: 09/11/2018 12:05:41 »

By plastic magnet, I am not talking about a magnet glued onto a plastic item.  I'm talking about the magnets made from plastic of sorts, flexible, roughly the same shape, size and thickness as a typical 'business card' and, just as thin.  Ads are usually printed on one surface; see photo below.

magnets3.jpg (54.67 kB . 656x492 - viewed 10406 times)

No matter how I orientated the two I could not sense any repelling and they always stuck together.
Note that the flat magnets that I used were not printed on either side.
Surely they must have polarity?