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user237650
  • Member for 5 years, 9 months
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119 votes
3 answers
118k views

Why is thymine rather than uracil used in DNA?

  • 13.5k
111 votes
3 answers
25k views

Are male and female brains physically different from birth?

  • 2,767
109 votes
9 answers
21k views

Why do plants have green leaves and not red?

  • 1,209
100 votes
3 answers
17k views

What's the evidence against SARS-CoV-2 being engineered by humans?

  • 1,645
92 votes
4 answers
7k views

Why did the process of sleep evolve in many animals? What is its evolutionary advantage?

90 votes
6 answers
32k views

How could humans have interbred with Neanderthals if we're a different species?

  • 1,003
84 votes
4 answers
133k views

Death because of distilled water consumption

  • 1,169
64 votes
2 answers
8k views

Why does it hurt the next day after doing significant exercise?

  • 917
50 votes
2 answers
9k views

Why does cutting onions cause tears?​

  • 829
44 votes
4 answers
10k views

Why are bruises not lethal?

43 votes
6 answers
12k views

How do scientists kill the bacteria they themselves made resistant?

  • 499
42 votes
5 answers
8k views

Why Is Most Life Symmetrical Externally But Not Internally?

  • 1,201
40 votes
1 answer
8k views

Does it make sense to classify all humans in a single species?

  • 67.7k
39 votes
5 answers
10k views

How does a baby deer stand the day it's born?

36 votes
2 answers
13k views

How many mosquitoes would it take to "drain" enough blood to put a person into shock?

  • 516
34 votes
2 answers
3k views

Can any animals photosynthesize?

  • 1,325
34 votes
3 answers
4k views

How and where, in the human brain, are memories stored?

34 votes
3 answers
59k views

Why is ATP the preferred choice for energy carriers?

  • 1,517
33 votes
1 answer
4k views

I just had my genome sequenced. Can someone tell me what these different file formats are?

  • 469
31 votes
3 answers
33k views

Why is saltatory conduction in myelinated axons faster than continuous conduction in unmyelinated axons?

  • 313
31 votes
2 answers
9k views

Why do tattoos persist if body cells are regularly renewed?

  • 469
29 votes
3 answers
292k views

Why can white hairs get dark again?

  • 3,266
29 votes
3 answers
9k views

Does animal blood, esp. human, really have similar salinity as ocean water, and does that prove anything about evolution?

  • 401
29 votes
2 answers
22k views

What causes fingerprints to form and why is the pattern formed unique?

  • 853
29 votes
4 answers
4k views

What does vaccine efficacy mean?

28 votes
5 answers
9k views

What are the advantages of forgetting?

  • 3,239
25 votes
4 answers
162k views

What is a coupled reaction and why do cells couple reactions?

25 votes
1 answer
11k views

Why do stars disappear when I look at them?

  • 2,475
25 votes
2 answers
5k views

Does sleeping fewer hours than needed cause common cold?

  • 383
25 votes
1 answer
28k views

Why does hair grow after trimming but remains at a constant length after a while?

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