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Balloons are bad for the Earth because they are hazardous to wildlife and can cause outages and fires if they drift into power lines.

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AWx4 TIL that Ignaz Philipp Semmelweis dropped the mortality rate for childbirth from 12% to 2% after he insisted doctors wash their hands in between handling cadavers and delivering babies.
OoN16 TIL Birds don't urinate. Instead, they convert nitrogen to uric acid.
rWbM TIL Young Benjamin Franklin was a street performer, composing songs, poetry, and prose about current events which he would perform in public and sell in printed form. His father convinced him to stop because of the stigma of buskers, which later contributed to his support of free speech.
RZw1 TIL Only one complete Viking helmet that has ever been discovered: the Gjermundbu helmet. It does not have wings or horns.
KYODw TIL that blood cells are developed inside our bones.