Due to an unfortunate teleportation malfunction, this mad scientist has just found himself in the vacuum of space.
With no oxygen, he might be tempted to hold his breath, but this would only accelerate his demise.
The air in his lungs is desperate to expand, so if he doesn't release it right away, his lungs will rupture.
Our poor professor quickly exhales, and his skin's tensile strength prevents the rest of his body from bursting, but things are still looking grim.
Without surrounding air pressure, his bodily fluids begin to vaporize in a process called ebullism.
His skin swells, moist surfaces like his eyes start to boil, and bubbles form within his vessels, obstructing blood flow.
This is all exceptionally painful, but while these nightmarish effects will take roughly 90 seconds to reach their deadly conclusion, he'll mercifully pass out from lack of oxygen within about 15 seconds of arriving.
And even though space is barely above the temperature of absolute zero, our scientists won't die by freezing.
Because unlike on Earth, where body heat can transfer to molecules in the environment, in space it can only leave by slowly radiating away.
It'll take hours before our professor becomes a human popsicle, and by then, he'll have perished a long time ago.