And he takes the end of it and plugs it into a computer much less advanced than the one currently clipped to his belt loop. It is already booted up. He starts a browser Daphne has never heard of and looks for old familiar websites. Google exists! It hasn't done so for very long, but it is there. Wikipedia isn't. Damn. Muttering about that, he looks up the current scope of malarial mosquitoes.

Malarial mosquitos: exist

"As far as I know, we don't have any mole people or cloud giants, and if we did have cloud giants I sincerely doubt we have treaties with them. Go for it."

"All right. I'll be back in the morning, probably loitering outside your building rather than alarm your dorm-mates by conjuring a key. Sleep well!"

"Thanks. Have a good malaria extinction."

Some of the students give him odd looks, but no more than that. When Daphne comes out, spots him, and waves, even the odd looks die down.

"Good morning!"

"Good morning! Have a productive night?"

"I did! Flew all over Africa depositing stupid but hopefully very sexually attractive mosquitoes which can't bite and shoot blanks. If I've made enough, the mosquito population will drop to almost nil, and another pass next year will finish the job if it's incomplete."

"I hope that doesn't screw with the environment too much."

"Shouldn't. Just a few mosquito species of many. My mortal world got rid of them without much of a hiccup. If this world proves different I could go put them back after the malarial parasite has had time to run out of homes."

"Okay, that's good then. Nice picnic."

"Want some?"

"What is it?"

"It's whatever you like, but I'm having apple fritters and Canadian bacon and fancy coffee." Sip.

"Those things all sound fantastic."

He hands her a plate.

"Unfortunately, most things can't be cured quite that straightforwardly. You aren't having bee problems yet, those I could also fix via the 'create huge numbers of insects' method. I have interesting drugs and gadgets but they would need to be distributed by doctors or at least someone with a legal identity, and I'm only one person. You don't happen to have contacts at the NIH or anything similarly acronymical and medical, do you?"

"Not me personally, but you may note that this is the campus of a reasonably-sized university."

"I have noticed that. Maybe you can tell me who to go wow and I can see if that works. One thing I can do that I cannot teach humans how to do is heal amputees, which would be suitably dramatic to get me all kinds of scientific attention but requires an amputee willing to let me saw off their stump so I have a clean end to work from..."

"Well, I can definitely introduce you to some biology professors. I don't know about amputees but I've seen enough to be confident enough in your abilities to let you take a finger off if you can do it more cleanly than sawing."

"I mean, slightly more cleanly than sawing and I could numb you completely but the show-off-ness would be slightly dented by the part where you don't have a documented history of missing a finger. ...Say, is the Randi Prize a thing here?"