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Why Didn't Evolution Give Us the Ability to Smell Fresh Water?

science.howstuffworks.com/life/evolution/humans-smell-fresh-water-evolution.htm

You'd think being able to smell drinkable water would be an evolutionary advantage. But we can only smell things that suggest potable water. Why is that?

Do Uber Drivers Discriminate Racially? A Study Says Yes

auto.howstuffworks.com/tech-transport/do-uber-drivers-discriminate-racially-a-study-says-yes.htm

Do Uber and Lyft drivers discriminate less than taxi drivers? HowStuffWorks Now looks at a study with mixed results.

Cyanosis: Why Your Fingers Turn Blue

health.howstuffworks.com/diseases-conditions/cardiovascular/heart/cyanosis.htm

It might be OK for a Smurf to have blue fingers, but for the rest of us, it's something you don't want to see. Cyanosis is usually a sign of a bigger health problem.

What Is the Rarest Blood Type in the World?

health.howstuffworks.com/human-body/systems/circulatory/rarest-blood-type.htm

There are eight major blood types and some are more common than others. But what's the rarest of them all?

You Have a Thermostat, But Do You Need a Hygrometer, Too?

science.howstuffworks.com/nature/climate-weather/meteorological-instruments/hygrometer.htm

Hygrometers are used by many professionals to monitor levels of humidity in the air. So, do need one in your home?

Why Don't You Ever See Square Vegetables?

science.howstuffworks.com/life/genetic/close-are-to-growing-square-tomato.htm

At least not in nature. Scientists have discovered the two gene families that play key roles in making fruits and vegetables either round or long. Could a square fruit be on the horizon?

An Alien Asteroid's Been Lurking in Our Solar System Since the Beginning

science.howstuffworks.com/alien-asteroids-been-lurking-in-solar-system-since-beginning.htm

An alien asteroid called BZ 509 may have arrived at our solar system billions of years ago and didn't buy a return ticket. HowStuffWorks explains.

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