system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did a fly survive being microwaved?

Yesterday morning I woke up and proceeded to make my instant coffee as usual.  I filled up my mug of water, put it in the microwave for a minute and a half, and stared out my window.  As the timer was getting close to going off, I turned my attention to the microwave and noticed something buzzing around.  Upon closer inspection, I see that there is a fly inside the microwave flying around.  It took me a few seconds of staring at the darn thing before I realized that I must have shut him in there when I put the water in (I wasn't being cruel, this was pre-caffeine).  I opened the door and it flew out.  Grabbing my cup of water, which was quite hot, I was left pondering why the microwave boiled my water and not the fly.  Is there something about their exoskeletons that protected him?  Did I just create a fly version of Peter Parker?  How was the buggar still flying?  Is he sitting somewhere in my house plotting his radioactive revenge?
gpt
Fear not, you have not created a fly version of Peter Parker.

A microwave works by firing waves of energy into your food. There is basicly a series of ray gun death zappers in there. Anything that gets in the way of it has its molecules shaken around, this motion creates heat which is why you got to enjoy a hot coffee.  Because they are shooting the energy in pretty much straight lines, the microwave includes a tray at the bottom which will spin your coffee around. It does this to ensure that the coffee passes through the rays to maximise its efficiency. If your coffee just sat there not spinning, it would take longer to get hot as it wouldn't bump into so many of the rays.

However, our fly friend is pretty small - certainly much smaller than a cup of coffee. He is actually small enough to avoid the death rays. Also, as he can fly, he can buzz around and avoid the death rays. Thus he can survive it as he will never go into the beam of death.

The same is true of an ant. If you were to put an ant into a microwave (and please dont, its mean) with no tray, he will be fine. He will wander over to a space where the death rays are not hitting and stand there and lol at your attempt to zap him. However, put the same ant in again, only this time on the spinning tray of death, and he cant move fast enough to avoid the rays and will get zapped. Thankfully, our friendly fly has aerial manoeuvrability on his side, so he foiled your spiney tray of death and lived to buzz another day.... without turning into SuperFly.