A small pox variolation kit to ~13thC somewhere in the Americas. Probably the PNW to preserve the linguistic diversity there, maybe the amazon river, the Tlaxcala or the groups who would go on the confederate into the Haudenosaunee.
Vials of horse-plague to the cucteni trypillians, see if we can’t blunt that Indo-European expansion somewhat. If it’s virulent enough, maybe we get lucky and weaken the power of aristocrats across Eurasia for millenia to come. (Sorry horses!).
Just for me, some magic mushrooms to shangqiu, henan ~325 BCE ish. See if I can’t convince Zhuang Zhou to trip with me.
It’s not so much the fire in Alexandria that you have to worry about although that is what is remembered, it’s the people who are setting fire to the library of Alexandria that you have to worry about. A single fire extinguisher won’t necessarily stop people from killing you and then burning everything down anyway.
My suggestion would be to also include a machine gun and a couple of hundred rounds of ammo so that you can kill them first and stop the fire from ever being started in the first place.
It’s not so much the fire in Alexandria that you have to worry about although that is what is remembered, it’s the people who are setting fire to the library of Alexandria that you have to worry about. A single fire extinguisher won’t necessarily stop people from killing you and then burning everything down anyway.
My suggestion would be to also include a machine gun and a couple of hundred rounds of ammo so that you can kill them first and stop the fire from ever being started in the first place.