You manage to find a way to time travel 100 years to the past, but you can only communicate one thing before you return to the present. Any speaking, writing, signing, or signaling counts as one message.
What would you say to the people of the past? Would you give them invaluable knowledge or tell them a random meme? Would you warn them of future calamities or find a way to screw us all over?
Regardless, I’m curious.
You know the Spanish flu? That’s not going to be the last pandemic.
Better get your asses into shape and develop decent countermeasures.
Oh yeah. Bacteria can become resistant to antibiotics, natural selection and all that jazz. Do not, I repeat DO NOT overprescribe them.
Credit ain’t infinite.
Also, World War I isn’t truly the war to end all wars.