If you put chalk under a powerful microscope—white cliffs of Dover type chalk, not the modern blackboard variety—you will see something like this Because it's not just a rock.

Well, if you look under a microscope, as British naturalist Thomas Huxley did in the 1860s, what you see is this: PLOS Biology via Wikipedia Chalk is composed of extremely small white globules.

Under the Microscope, accessed May 25, TikTok profile Thank you for supporting our journalism. You can subscribe to our print edition, ad-free app or electronic newspaper replica here.

[upbeat music] [Amiel] This, my friends, is rice. There are over 40,000 different. cultivated varieties out there. Long grain, short grain, black rice, ...