Jasdip, it wasn’t a guess. I knew it. We take a train trip, the VIA Skeena, every so often from Jasper to Prince Rupert and one of the stations is Smithers BC. Apparently, that is where the inventor is from and it is in their museum. LOL, he’s a celebrity in them thar woods. https://virtualbvm.omeka.net/exhibits/show/joseph-coyle/coyle-egg-safety-carton eta That train run also has the spot where the last Canada Post Office is where the mail was still delivered by train. It was still operating a few years ago. Penny, BC Residents waiting for the train and their mail.

That's sooooooooooo funny! After I posted I looked it up, said "textbooks". :0) Chili dog! ------------------------------------------------------------------------------------------------- Gorilla

Wow, I finally got my once a year answer right. Cannabis, but I think only 10% of North America use it.

I was thinking solar flares...exposure to the sun....our ancestors used to be outdoors more...