00:02We like to think science has all the answers.
00:05But the truth is, the universe is still full of giant question marks.
00:11Here are five mysteries that still keep scientists up at night.
00:15One, dark matter and dark energy.
00:19Here is a terrifying thought.
00:21We can only see about 5% of the universe.
00:24The rest, it's made of dark matter and dark energy.
00:30We can't see it, touch it, or measure it directly.
00:33We only know it's there because of its gravitational pull on the stars we can see.
00:39Basically, 95% of reality is invisible to us.
00:45Two, the placebo effect.
00:47We know that it works, but we don't really know how.
00:50If you give someone a sugar pill but tell them it's medicine, their condition often improves.
00:57The human mind can literally trick the body into healing itself, altering physical symptoms through sheer belief.
01:06The mechanism behind this mind over matter connection remains a biological puzzle.
01:13Three, why we sleep.
01:15It sounds simple, but biologically, sleep is weird.
01:19Every animal does it, yet it makes us vulnerable to predators for hours.
01:24While we know sleep helps repair cells and consolidate memories, scientists still argue about the fundamental evolutionary reason why we need to go unconscious for a third of our lives just to function.
01:38For the wow signal.
01:41In 1977, a radio telescope picked up a strong, 72-second signal from deep space that looked exactly like an artificial transmission.
01:53The astronomer monitoring the data circled it and wrote, wow, next to it.
01:59It has never been heard again.
02:01Was it aliens?
02:02A glitch?
02:03We still don't know.
02:05Five, why cats purr?
02:08We know cats purr when they are happy, but they also purr when injured or stressed.
02:14Even weirder, we don't know exactly how they do it.
02:17There is no specific purring organ in their throat.
02:22It seems to be a neural oscillator in their brain, but the exact trigger remains a mystery.
02:28The more we learn, the more we realize how little we know.
02:32Subscribe to become more knowledgeable every day.
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