The oldest known grass beds from 200,000 years ago included insect repellents
The ancient bed remnants include fossilized grass, bug-repelling ash and aromatic leaves
![South Africa’s Border Cave](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/08/081320_BB_grass_feat.jpg?fit=1028%2C579&ssl=1)
South Africa’s Border Cave, shown here at its entrance, contains bits and pieces of the oldest known grass bedding, dating to around 200,000 years ago, researchers say.
A. Kruger