1,160 reputation
411
bio website sbseminar.wordpress.com
location New York, NY
age 34
visits member for 2 years, 6 months
seen Aug 24 at 15:45

I'm an assistant professor in mathematics at Indiana and an early adopter of Math Overflow. I was the first user at mathematics.SE.


Jun
9
awarded  Yearling
May
22
comment Were there any flying dinosaurs?
"Flying reptile" is often used not to mean "a reptile which flies" but instead as a synonym for Pterosaur.
Mar
31
awarded  Nice Answer
Feb
9
comment How many times did life emerge from the ocean?
@ChinmayKanchi: I'm not sure how that's relevant. Certainly basal amniotes were land-dwellers (that's the first land). But early snakes may have been aquatic (and closely related to Mosasaurs) which would give the second sea. Then basal Elapids would then give the second land, the sea snakes the third sea, and the Australian Elapids the third land. Anyway, as I said current evidence is towards a fossorial origin of snakes against an aquatic origin.
Feb
9
comment How many times did life emerge from the ocean?
@ChinmayKanchi Fascinating! If it turns out snakes originally emerged in the sea that'd be sea->land->sea->land->sea->land! (Though my understanding is that currently early snakes being burrowers is more likely.)
Jul
11
awarded  Nice Answer
Jun
9
awarded  Yearling
Feb
7
answered A question regarding evolution
Nov
14
comment When do most mammals mate?
How are you counting here. Each mating counts once? Each individual counts once? Each species count once? Each genus counts once? etc.
Nov
13
comment Do crocodiles age?
Similarly in Tolkein, elves are immortal but can die in battle or from heartbreak. Both uses of "immortal" are common, and so MCM did the right thing by clarifying which way he was using it.
Oct
5
comment Why do the two hemispheres of the brain control the opposite sides of the body?
I'd bet it's non-adaptive.
Oct
5
awarded  Custodian
Oct
5
reviewed Close What are the different ways an exon gets spliced?
Oct
4
comment Since Darwinian times, has there been any striking/notable effects of evolution on humans?
Fair enough. What would you say the minimum time frame is? Certainly there are plenty of examples of substantial changes happening in less than 100 generations.
Oct
4
comment Is it more likely that the very first living organisms had a linear genome?
Nifty! Learn something new every day.
Oct
4
comment Since Darwinian times, has there been any striking/notable effects of evolution on humans?
I agree that they don't appear to produce specific evidence of that any of their examples are in the 200 year time frame. However, I don't think there's anything in the paper that precludes some of them being very recent.
Oct
4
comment Since Darwinian times, has there been any striking/notable effects of evolution on humans?
I would say that a species has changed as soon as the frequency of some gene has changed. Thus all species are always changing, and no generation is exactly like the previous one.
Oct
4
comment Since Darwinian times, has there been any striking/notable effects of evolution on humans?
In my opinion you are taking a very narrow view of what evolution means. However, with your clarification I have removed my downvote.
Oct
4
comment Since Darwinian times, has there been any striking/notable effects of evolution on humans?
@terdon: Unless I'm missing something, isn't that 6,600 an estimated average age? They are discussing several hundred different genes, some may be more recent. Furthermore, as they say, the timeframe is not precise and may only indicate when the gene became common.
Oct
4
answered Is it more likely that the very first living organisms had a linear genome?