Google
 

Wednesday, June 6, 2012

Is microwaving food safe?


Is microwaving food safe?

There are two aspects to this.  One of them – is food in a microwave dangerous to eat?  The other is, if you go near a microwave, is it dangerous?
First of all, microwaves are a form of light, a form of electromagnetic radiation.  In the spectrum, you go from visible green, yellow, red, into the infrareds, the deep infrareds, through some millimetre waves and then there are microwaves and just beyond that, radio waves.  And the further down in that direction you go, the less energy each photon of the light has got.  So, the light which is actually dangerous itself is up in the ultraviolet which can give you cancer.
So, microwaves are probably not dangerous – they're certainly not dangerous with regards damaging cells chemically and giving you cancer.  You can obviously get too hot from them and overheat because, the piece of chicken in a microwave obviously is getting damaged because that's way it gets more tasty.  So, if you had a microwave with a hole in the back and you stood near it, then it would certainly be dangerous.  But as long as the microwave is properly designed and you're not standing right up next to it and kind of leaning over it and hugging it, there shouldn’t be a problem.
    And it won't do anything to the chemical composition of the food that you're heating up?
    It’s heating the food up in broadly the same way as any other means of cooking, just making it hotter.  The one difference is that it might not heat it quite as evenly.  So you might get parts of the food which have essentially been overheated and if you overheat food then you can reduce the amount of vitamins in it slightly.  So it’s not going to make it dangerous, but it might make it slightly less good for you.

How do kinetic watches work?


How do kinetic watches work?

If you have ever taken a cup of coffee or something with some foam on the top and spun the cup, the coffee stays still, but the cup turns around.  This is based on the same principles. 
There are some weights inside the watch which are free to move and as you move your wrist around, the weights tend to stay still when your wrist is moving, and so they move around and spin around as you move around, and go through your daily life.  This relative movement between the weight and the watch is connected to a little generator via some gears and cogs, and that charges the battery.  And so, as long as you keep using it and moving around, it will charge the battery up and it should keep going.