Sniffling. Sneezing. Runny eyes. Springtime brings a rush of seasonal allergies that plague us – but historically, allergies were mild – if they existed at all. In fact, allergies became a force to be reckoned with only in the 1970s. Cheddar explains how we’re to blame for our own allergies.
Further Reading:

1: Atlas Obscura
https://www.atlasobscura.com/articles…

2: Nature
https://www.nature.com/articles/35037000

3: Encyclopedia Brittanica
https://www.britannica.com/science/Du…

4: Tree Clinic
http://www.treeclinic.co.uk/

5: Scientific America
https://blogs.scientificamerican.com/…

6: Science Direct
https://www.sciencedirect.com/topics/…

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