Harvard University has an incredible collection of frozen toenails that may hold the clue to curing ovarian cancer.

Among other bodily samples taken over the past four decades, it’s the toenails and the ponytail clippings that are of interest to scientists. While blood provides a snapshot of your body’s composition in that moment, hair and toenails provide an average of hormones and elements that were floating around your body for the past several months! Your big toe holds a year’s worth of circulating chemicals.

The envelopes stuffed with toenail clippings in Harvard’s basement are being used in over 400 research projects examining 40 diseases.

Who knew perfunctory beauty chores could be so revolutionary.

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