Important note, if you take a straw that separates into two split straws (kinda in a “Y” shape) that from a topological point of view is two holes, because one is for one of these paths, and the other is an extruded hole on the side of the first path. In topology you can’t break or mend material, but you can pull, stretch, squeeze and move it all you want. So you can move one of the split straw “legs” to the bottom of the whole straw, getting a shape similar to a “V”, it would look pretty much like a pair of pants. And topologically speaking it would be exactly the same. So… One straight hole for your mouth all the way down to your anus. Another two are there for your nostrils, that’s 3 already. The rest are for your tear ducts, which have two holes on the edge of your eye, (so four in total) which merge and then connect to your nose.
So a human, from a topological perspective, is just a seven holed doughnut. Also Vsauce made a great video about that, with pretty great animations.
Yep, here’s a video about it and an example of an egg being fried on it.
Glass is a pretty poor thermal conductor so it takes a bit more heat from your stove to make the frying pan hot, but at the same time it means that whatever you’re frying isn’t getting as hot as quickly so it’s less likely to burn or cook unevenly, and you can shut down the stove earlier than with a traditional pan and still have it fry something.
Like most things in life, it’s a trade off and what you think of it depends on what you’re going and how you want it to be done