The expansion of the universe is accelerating, but we're not quite sure why. The best of modern models note the force behind this process as dark energy — despite the fact that in fact dark energy may not exist at all. A new study has shown that if another mysterious phenomenon — dark matter — has some unusual magnetic properties, then it may be responsible for the observed expansion.
We all know perfectly well from childhood that finding a needle in a haystack is still a problem. But impossible tasks simply do not exist! And if you don't take our word for it, then here are real ways for you to actually find a needle in a standard haystack weighing about three hundred kilograms.
It is more difficult to see electromagnetism than to feel, for example, the force of gravity. In order to see electricity in action, you need to create special conditions, and it's not as difficult as it may seem.