witch with a sword

going back in time to do a tour of the americas in the late 1400s to be like "hey if you see a guy who looks like me? kill his ass"

Would present the guy who came up with droplet theory to debunk miasma theory solid evidence of airborne transmission of multiple different viruses

Hmm. I would go back before Elvis and invent noise rock and make that the rock and roll revolution and then mysteriously die and come back now and just see what the fuck music is like

Give Ferdinand Cohen-Blind the gun they killed Shinzo Abe with.

Solar panels at the dawn of the industrial revolution?

Don't need a time machine to check the results of this one. A working Solar Thermal Engine was presented at the 1878 Exposition Universelle in Paris.

Despite the benefits, coal technology was seen as cheaper and easier. 🙃🙃🙃

transphobes say that trans people are a modern phenomenon, so i'd just go back and document all the trans people throughout history. sculptors, painters, photographers, writers... hire them all throughout history (in their own eras) to create works depicting trans people. get those existing trans people to document their own lived experiences. bolster whatever their hormone regimens were with modern HRT.

Give Thomas Midgley a Dodge Viper. Either it shows him that leaded gasoline is unnecessary or he fails to control a famously difficult to control sports car and pancakes it, either way saves people a lot of trouble.

Tell the auto modelista devs to make it play like an arcade racer instead of a sim

• every time someone seriously suggests patenting a vaccine, medicine, or medical equipment, they mysteriously explode
• every time someone starts to build an atomic weapon / order for them to be built, they mysteriously explode
• that one time Adam Smith fell in a tanning pit¹, he'd somehow not make it back out
• find whatever bugs were going to evolve into mosquitos, and they mysteriously explode
• henry ford mysteriously explode

1. [src] "According to one story, Smith took Charles Townshend on a tour of a tanning factory, and while discussing free trade, Smith walked into a huge tanning pit from which he needed help to escape."

detonate a series of nuclear bombs around the Ring of Fire in 1980 in an attempt to make Project Wingman real but with Cold War era planes

Plant two huge stone Argonath-style statues pointing at each other with outstretched fingers, one at the South-West tip of Sierra Leone and one at the North-East tip of Brazil. Some time in like the 4th or 5th millennium BCE.

shoot the lungfish

What's the earliest time in history when people would have the technical base to replicate M2HB and ammo?

Aisha wins the battle of the camel and becomes Caliph(a). I think it would be cool to see how Islam evolves over the years with a history of a very prominent female leader.

What happens to the world if the Apostle Paul is mysteriously killed on the road to Damascus, preventing Christianity from being hijacked by a weird incel?

I give the Romans Twitter. See how those messy sons of bitches screw this up, I've seen their graffiti. (Side note, also introduce them to spray paint).

I have a pet theory that romans were like that because of having to live their whole lives knowing that they'd never get to eat a potato

Make Booth miss.

Feed some updated targeting info to allied bombers so that Von Braun and his bunch get fragged before the Americans reach them.

Drone the fuck out of Isabella and Ferdinand's forces.

Dose Edward Teller and blast a mix of Math Rock and The Recitation at him after he argues with Oppenheimer over the "Super".

Tell Truman, "instead of supporting The Nabka, let's do a purge of anti-Semites here in the States."

Jimi Hendrix but he listens to Sophie

I've dreamed of sinking Columbus's ships, but this is next level.