May 21: edit
- 1799 - Mary Anning was born in Lyme Regis, Dorset.
- 1892 - Grigore Cobălcescu died in Romania.
- 1930 - Emily H. Vokes was born in the USA.
First Dinosaur Tracks from the Arabian Peninsula
Anne S. Schulp, Mohammed Al-Wosabi, Nancy J. Stevens
published 21 May 2008