24 Daily Mysteries Science Hasn't Figured Out
Why are these questions unanswered? Perhaps Science is just difficult.
![24 Daily Mysteries Science Hasn't Figured Out](https://s3.crackedcdn.com/phpimages/pictofact/7/9/2/576792.jpg?v=1)
Science has given us a great many discoveries and innovations, but for all the amazing things the field has done for us, it surprisingly has left a lot of seemingly simple questions unanswered.
Why? We aren't sure.
![Scientists still don't get why women's breasts are sexual. CRAGH Human females are the only species to have permanently enlarged breasts. While it has](https://s3.crackedcdn.com/phpimages/pictofact/0/9/3/576093.jpg?v=1)
![CRACKED.COM WHY DO CATS PURR? It has been noted that cats purr when feeling either pleased, hungry or frightened. They might purr when they're injured](https://s3.crackedcdn.com/phpimages/pictofact/0/9/8/576098.jpg?v=1)
![Why do almost all species reproduce sexually? GRAUN Asexual I reproduction (reproduction without a partner) is more efficient and less risky However,](https://s3.crackedcdn.com/phpimages/pictofact/0/7/9/576079.jpg?v=1)
![WHY DO WOMEN ? MENSTRUATEE HUMANS ARE ONE OF THE FEW MAMMALS THAT HAVE A MENSTRUAL CYCLE AND IT'S UNCLEAR WHY WE EVOLVED TO HAVE ONE. Early on, scient](https://s3.crackedcdn.com/phpimages/pictofact/0/9/4/576094.jpg?v=1)
![WHY DO WE HICCUP? Hiccups are extremely annoying and they don't serve any real purpose. sO, WHY DOWE EXPERIENCE THEM? Well, scientists aren't sure, th](https://s3.crackedcdn.com/phpimages/pictofact/0/7/7/576077.jpg?v=1)
![WHY DO WE BLUSH? We all feel our cheeks redden and warm when we're embarrassed, but we have no idea why. Neither do scientists though. Ray Crozier, a](https://s3.crackedcdn.com/phpimages/pictofact/0/5/5/576055.jpg?v=1)
![HDAO WHY DO WE HAVE ? PUBIC HAIR Great apes' hair in the pubic region is much thinner and shorter than elsewhere on the body, while humans are the exa](https://s3.crackedcdn.com/phpimages/pictofact/0/6/0/576060.jpg?v=1)
![WHY DOES 90% OF HUMANITY NEED TO KI5S While some experts say we have inherited this habit from ancestors who ate from their mothers' mouth. other scho](https://s3.crackedcdn.com/phpimages/pictofact/0/5/6/576056.jpg?v=1)
![WHY DO WE CRY? Many animals shed tears of pain, but only humans cry to express emotions ranging from sadness to joy. It is thought that emotional tear](https://s3.crackedcdn.com/phpimages/pictofact/0/9/7/576097.jpg?v=1)
![CRACKEDCON WHY DO SOME PEOPLE SNEEZE WHEN THEY LOOK AT THE SUN? When looking at the sun, some people experience a sneezing fit; this phenomenon is cal](https://s3.crackedcdn.com/phpimages/pictofact/0/8/9/576089.jpg?v=1)
![SCIENTISTS ARE STILLTRYING TO EXPLAIN WHY TOMATOES HAVE MORE GENES COMPARED TO HUMANS Theories include for survivability & merely junk genes' but nobo](https://s3.crackedcdn.com/phpimages/pictofact/0/8/5/576085.jpg?v=1)
![Why do we have sinuses? Frontal sinus- Sphenoid sinus Ethmoid sinus Nasal cavity Maxillary sinus Pharynx (throat) We still don't know exactly why our](https://s3.crackedcdn.com/phpimages/pictofact/0/8/3/576083.jpg?v=1)
![You sometimes twitch in your sleep and get jolted awabe. We have a name for that, but we don't know the cause behind it. It is called a hypnic jerk. T](https://s3.crackedcdn.com/phpimages/pictofact/0/5/8/576058.jpg?v=1)
![We still don't know what 98% percent of our DNA is supposed to do. JUNK DNA oc Scientists haven't still figured out what all this junk DNA does: som](https://s3.crackedcdn.com/phpimages/pictofact/0/7/2/576072.jpg?v=1)
![WHAT CAUSES THE NOCEBO EFFECT? The Nocebo effect is the Placebo's evil twin. It proves that negative thinking can be harmful to our health. However, a](https://s3.crackedcdn.com/phpimages/pictofact/0/6/9/576069.jpg?v=1)
![WHY PEOPLE TASTE ? THINGS DIFFERENTLY THE ANSWERS VARY WILDLY AND SCIENTISTS ARE STILL TRYING TO UNVEIL ALL THE MYSTERIES BEHIND FOOD AND TASTE REASON](https://s3.crackedcdn.com/phpimages/pictofact/0/7/4/576074.jpg?v=1)
![CRACKED ? What drives tectonic plates? We know that individual plates around the globe collide with each other, sometimes with devastating results. Bu](https://s3.crackedcdn.com/phpimages/pictofact/0/6/8/576068.jpg?v=1)
![WHY DO HUMANS HAVE CHINS? APES DON'T HAVE CHINS. EVEN NEANDERTHALS DIDN'T HAVE THEM. So WHY DO WE? NOBODY KNOWS. AMONG THE THEORIES: CHINS... ... EVOL](https://s3.crackedcdn.com/phpimages/pictofact/0/8/0/576080.jpg?v=1)
![Why are most Caucasians born blue-eyed, yet only 1 in 5 adults have blue eyes? Scientists know that the pigment of the irises darkens until we're 2 ye](https://s3.crackedcdn.com/phpimages/pictofact/0/7/6/576076.jpg?v=1)
![HUMANS SMILE, ANIMALS GRIMACE? NOPE! Since Darwin's time, it's been thought that humans smile to express happiness, while animals bare their teeth onl](https://s3.crackedcdn.com/phpimages/pictofact/0/6/2/576062.jpg?v=1)
![CRACKEDCO why are some people... ..Left-handed? Only 10% of the population are Left-handed, and no one really knows why. Was it a mutation to give a c](https://s3.crackedcdn.com/phpimages/pictofact/0/5/3/576053.jpg?v=1)
![WHAT CAUSES STATIC ELECTRICITY? lt's not swapping electrons between differently charged materials, as it was originally thought. Static electricity oc](https://s3.crackedcdn.com/phpimages/pictofact/0/8/2/576082.jpg?v=1)
![CRACKEDCON Why Do We Have Allergies? We know allergies are an immune response to certain pollens and foods. But why? Some scientists think, when body](https://s3.crackedcdn.com/phpimages/pictofact/0/5/2/576052.jpg?v=1)
![SEXUAL CRACKED COM ORIENTATION 000 Why do people have different sexual preferences? There's no definitive answer. Scientist believe a major part of se](https://s3.crackedcdn.com/phpimages/pictofact/0/6/1/576061.jpg?v=1)