Roses are planted at the end of a row of grape vines on vineyards because they are very susceptible to powdery mildew and mold. As such, they act as an early warning sign of mold or mildew allowing the vineyard staff to react before it impacts the grapes. – WTF Fun Facts
Source: https://www.kj.com/blog/stopping-smell-roses-vineyard
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WTF Fun Fact – Da Vinci’s Oxen Heart Valve
Leonardo Da Vinci once created a replica of a heart valve by pouring hot wax into an oxen’s heart, making a mold of thin glass from the cast, and then pumping water mixed with seeds through it. He identified vortices which help close the heart valve after each beat. – WTF Fun Facts
Source: https://www.rct.uk/collection/919082/the-aortic-valve