How many T. rexes were there? Billions.
How many Tyrannosaurus rexes roamed North America during the Cretaceous period?
Plants & Animals
Apr 15, 2021
5
499
News tagged with population densities
Fast-growing parts of Africa see a surprise: less air pollution from seasonal fires
Often, when populations and economies boom, so does air pollution—a product of increased fossil-fuel consumption by vehicles, industry and households. This has been true across much of Africa, where air pollution recently ...
Earth Sciences
Feb 8, 2021
0
96
A new way to control microbial metabolism
Microbes can be engineered to produce a variety of useful compounds, including plastics, biofuels, and pharmaceuticals. However, in many cases, these products compete with the metabolic pathways that the cells need to fuel ...
Biotechnology
Dec 2, 2019
0
152
Spiders eat 400-800 million tons of prey every year
It has long been suspected that spiders are one of the most important groups of predators of insects. Zoologists at the University of Basel and Lund University in Sweden have now shown just how true this is - spiders kill ...
Plants & Animals
Mar 14, 2017
0
3873
Researchers use cellphone data to construct population density maps
(Phys.org) —A team of researchers made up of members with diverse, multi-national backgrounds has found a way to construct population density maps using cellphone data. In their paper published in Proceedings of the National ...
Physicists suggest electrical networks more at risk of cascading failure than thought
(Phys.org) —A team of physicists from Israel and the U.S. has discovered that mathematical modeling suggests modern electrical networks may be more vulnerable to cascading collapse than has been previously thought. In their ...
Endangered lemurs' complete genomes sequenced, analyzed for conservation efforts
For the first time, the complete genomes of three separate populations of aye-ayes—a type of lemur—have been sequenced and analyzed in an effort to help guide conservation efforts. The results of the genome-sequence analyses ...
Biotechnology
Mar 25, 2013
0
0
Scientists IDs genesis of animal behavior patterns
(PhysOrg.com) -- For the first time, MIT engineers and colleagues have observed the initiation of a mass gathering and subsequent migration of hundreds of millions of animals — in this case, fish.
Plants & Animals
Mar 26, 2009
0
0
Building footprints could help identify neighborhood sociodemographic traits
An analysis of building footprints in major US metropolitan areas identifies five different neighborhood types that vary in footprint size, shape, and placement, and which are statistically associated with varying neighborhood ...
Social Sciences
Apr 10, 2024
0
49
Amber reveals mating behavior of cretaceous water striders
Fossilized mating insects are an irreplaceable find for understanding the evolution of mating behaviors and life history traits in the deep-time record of insects.
Paleontology & Fossils
Apr 3, 2024
0
66
Population density
Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans. It is a key term used in geography.
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