How does something as temporary as a human footprint get preserved for more than 10,000 years? |
- How does something as temporary as a human footprint get preserved for more than 10,000 years?
- How sure are we that Proxima Centauri is indeed gravitationally bound to the Alpha Centauri binary pair?
- What makes pop rocks, "pop" when in your mouth?
- How do scientists know how much dark matter a galaxy has or doesn't have?
- What’s the difference between white ice and clear ice?
- Dark Energy makes up ~68.3% of the mass-energy of the universe today. Was it different a few billion years ago?
- How are giant highway bridges built?
- Is there a list of delayed neutron isotopes?
- In the brain of a deaf,blind, or mute person is the brain in the areas used to control those functions "dead" or are they used elsewhere?
- Why do some infections confer immunity and not others?
- How does the Higgs boson generate mass through interactions with other particles?
- Does the language we speak affect how we hear/perceive animal sounds?
- Does ice get harder as it gets colder?
- Do other species have “early birds” and “night owls,” or is this a uniquely human/ primate trait?
- Can man made elements be created naturally somewhere in the universe?
- What’s happening in the brain when someone gets intoxicated or tipsy? What causes people to do stupid things whilst drunk/tipsy?
- What are non-antibiotic alternatives to low dose doxycycline with similar anti-inflammatory mechanism of action?
- I keep hearing that we’re “running out of sand.” Is there not an abundance of sand in the dunes of the Middle East and Africa? Why can’t we use this sand as opposed to beach sand?
- Why does only the nasal portion of the optic nerve decussate at the optic chiasm? Or is this not the case in all animals?
- How does quantum entanglement imply “spooky action at a distance”?
- How do scientists determine the gravitational pull of exoplanets?
| How does something as temporary as a human footprint get preserved for more than 10,000 years? Posted: 29 Mar 2018 01:40 AM PDT Archaeologists have found human footprints that are 13,000 years old. How do footprints get preserved? [link] [comments]  |
| Posted: 29 Mar 2018 01:22 AM PDT |
| What makes pop rocks, "pop" when in your mouth? Posted: 29 Mar 2018 05:03 AM PDT |
| How do scientists know how much dark matter a galaxy has or doesn't have? Posted: 28 Mar 2018 10:46 PM PDT |
| What’s the difference between white ice and clear ice? Posted: 28 Mar 2018 09:06 PM PDT I realized I left my water bottle in the freezer too long, and all of it came out frozen. However, the ice in the middle of the cup was completely white and very opaque, while it was surrounded by clear ice like I'm used to. Is there a reason for this? [link] [comments]  |
| Posted: 28 Mar 2018 05:35 PM PDT I've seen lots of places describe the distribution of matter and energy in the universe to be: 68.3% Dark Energy 26.8% Dark Matter 4.9% Ordinary Matter But I haven't been able to find anywhere that talks about whether that has changed over time. Followup question: We know the universe is expanding in size, does that mean the overall density of the universe is decreasing, or does the total mass increase too? [link] [comments]  |
| How are giant highway bridges built? Posted: 29 Mar 2018 06:57 AM PDT What's the general process of building it and how do they manage to stretch those huge structures over large amounts of land? [link] [comments]  |
| Is there a list of delayed neutron isotopes? Posted: 29 Mar 2018 08:10 AM PDT Traditionally, delayed neutrons are listed into 6 groups by decay time. I'm having some difficulties finding information about how many different fission isotopes emit delayed neutrons. Is there a list somewhere, maybe in a paper? (Sorry about such a narrow, relatively high level, and uninteresting question.) [link] [comments]  |
| Posted: 28 Mar 2018 09:12 AM PDT |
| Why do some infections confer immunity and not others? Posted: 29 Mar 2018 01:46 AM PDT |
| How does the Higgs boson generate mass through interactions with other particles? Posted: 28 Mar 2018 08:03 PM PDT |
| Does the language we speak affect how we hear/perceive animal sounds? Posted: 28 Mar 2018 02:31 PM PDT |
| Does ice get harder as it gets colder? Posted: 28 Mar 2018 07:27 AM PDT |
| Do other species have “early birds” and “night owls,” or is this a uniquely human/ primate trait? Posted: 28 Mar 2018 04:08 PM PDT |
| Can man made elements be created naturally somewhere in the universe? Posted: 28 Mar 2018 02:15 PM PDT |
| Posted: 28 Mar 2018 09:04 AM PDT |
| Posted: 28 Mar 2018 08:39 PM PDT |
| Posted: 28 Mar 2018 08:01 PM PDT |
| Posted: 28 Mar 2018 09:54 AM PDT |
| How does quantum entanglement imply “spooky action at a distance”? Posted: 28 Mar 2018 06:04 PM PDT I've heard people describe quantum entanglement in terms of two entangled particles. Even when separated by a great distance the act of observing characteristics of one particle "instantly" determines characteristics of it's entangled counterpart. I've heard this described as "spooky action at a distance" (I believe this is an Einstein quote). As a point of comparison, imagine I flip a coin and write down the result (say, heads) on one price of paper, and the opposite of that result (tails) on another. Then shuffle the two pieces of paper and I put each in its own envelope and mail them to two different places. With an understanding of the setup, one recipient could open their envelope and "instantaneously" know the state of the other piece of paper. But it seems like a bold claim to say that there was some sort of action at a distance between the two envelopes or that the act of opening one envelope enacted some kind of influence on the other. In what way is quantum entanglement different than this? [link] [comments]  |
| How do scientists determine the gravitational pull of exoplanets? Posted: 28 Mar 2018 11:16 AM PDT |
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