This week’s entry: Mythological Human Hybrids What it’s about: For as long as humans have been making up stories, we’ve been making up stories about creatures who are part-human, part-animal.

There's a project to build human wings, but the creator may not have taken a good look at a chart of wingspan-to-mass ratios. Dot Physics blogger Rhett Allain shows why the numbers are so important.

At the average human running speed of 6 meters per second, a flier would need a suit with a wing area of 4.7 square meters for a successful launch. That’s hardly the end of the story, however.