Electromagnetism and Forces, Ep115 of A Cup of Coffee with Thomson

Do you know the 4 forces in the universe? OK, Thomson didn't know them either, but Dad does! Thomson also learns about icicles, something we don't get a lot of in San Francisco, but we are thinking about all of those dealing with lots of icicles right now- brrrrr!
Thanks for listening- stay warm and EVERYBODY LOVE EVERYBODY!!