/u/LibraryLass's posts in /r/askscience

Year:

Only show posts with narrations

Do "stable" isotopes have a half-life, or are they forever?

104 upvotes

Mark as read: Add to a list

When someone gets a transplant of an organ that they have two of, like a kidney, does the new organ have to come from the same side of the donor's body as the one it's replacing?

76 upvotes

Mark as read: Add to a list

Is an alloy a compound or a mixture? If it is a mixture, can compounds made of two or more different metals exist?

12 upvotes

Mark as read: Add to a list

Is there a clear difference between rock layers from different periods? How do we tell? Is the barrier at roughly the same level everywhere in the world?

7 upvotes

Mark as read: Add to a list

There are numerous instances in the animal kingdom of viviparous animals that (obviously) arose form oviparous ancestors. Are there any examples of the reverse, i.e. egg-laying animals whose evolutionary ancestors gave birth to live young?

5 upvotes

Mark as read: Add to a list

How big would a gas giant have to be to have comparable gravity to Earth? Could such a planet even exist?

4 upvotes

Mark as read: Add to a list

How does a cell "know" what type of cell it's supposed to be, if DNA contains all the genetic information for the entire organism? Can cells (other than stem cells) be tricked into becoming a different type somehow?

3 upvotes

Mark as read: Add to a list

If I got an organ transplant from a donor that had undetected cancer of the organ I was receiving, would it be able to survive and metastasize in me? What if it was cancer of another organ that had metastasized and implanted in the organ I was receiving?

2 upvotes

Mark as read: Add to a list

Am I bigger than a mouse because I have more cells, because my cells are bigger, or both?

2 upvotes

Mark as read: Add to a list

Is there a "pure" white light that doesn't display any spectral lines?

1 upvotes

Mark as read: Add to a list

Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Do "stable" isotopes have a half-life, or are they forever?	104
When someone gets a transplant of an organ that they have two of, like a kidney, does the new organ have to come from the same side of the donor's body as the one it's replacing?	76
Is an alloy a compound or a mixture? If it is a mixture, can compounds made of two or more different metals exist?	12
Is there a clear difference between rock layers from different periods? How do we tell? Is the barrier at roughly the same level everywhere in the world?	7
There are numerous instances in the animal kingdom of viviparous animals that (obviously) arose form oviparous ancestors. Are there any examples of the reverse, i.e. egg-laying animals whose evolutionary ancestors gave birth to live young?	5
How big would a gas giant have to be to have comparable gravity to Earth? Could such a planet even exist?	4
How does a cell "know" what type of cell it's supposed to be, if DNA contains all the genetic information for the entire organism? Can cells (other than stem cells) be tricked into becoming a different type somehow?	3
If I got an organ transplant from a donor that had undetected cancer of the organ I was receiving, would it be able to survive and metastasize in me? What if it was cancer of another organ that had metastasized and implanted in the organ I was receiving?	2
Am I bigger than a mouse because I have more cells, because my cells are bigger, or both?	2
Is there a "pure" white light that doesn't display any spectral lines?	1