Venus orbits the Sun 13 times for every 8 Earth orbits. If you track the relative positions of Earth and Venus over an 8 year period, this is the resulting pattern.
(via I fucking love science)
Mutant Cockroaches have learned to evade sugar traps
According to a new study in Science, some roaches’ tastes are evolving to the point where they’re refusing to gobble down glucose, a form of sugar commonly found in plants. “They now perceive glucose as bitter,” says Coby Schal, an entomologist at North Carolina State University and one of the report’s authors. And while that might sound like good news for the roach-infested, it’s not: sucrose is the key attractant used in roach traps — and many of the nasty little creatures are no longer interested.
How did this happen? Turns out it may be our fault.
When prehistoric roaches lived in the wild, experts have theorized, it made sense to be glucose-averse—that mutation helped them avoid glucosides, or toxic glucose-containing molecules found in certain plants. “They’re nasty substances,” says Schal.
But when cockroaches joined us in caves, and ultimately in homes—away from the threat of glucosides—“they would have lost this trait, because it became maladaptive,” says Schal. Regular sugar, after all, is a highly concentrated source of energy, and if roaches were wired to avoid it, their odds of survival would drop. “If you brought them a Krispy Kreme donut,” Schal explains, “they couldn’t eat it.”
The mutation remained in the genome, though. And when humans began putting glucose in roach poison, we reactivated it—so much so that when some roaches now taste sugar, Schal says, “they jump back as though you’ve given them an electric shock.”