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Why are whales big, but not bigger?

Photo of whale jumping out of the water
Image by skeeze from Pixabay

Matthew Savoca, Stanford University; Jeremy Goldbogen, Stanford University, and Nicholas Pyenson, Smithsonian Institution

Both toothed and baleen (filter-feeding) whales are among the largest animals ever to exist. Blue whales, which measure up to 100 feet (30 meters) long and can weigh over 150 tons, are the largest animals in the history of life on Earth.

Although whales have existed on this planet for some 50 million years, they only evolved to be truly gigantic in the past five million years or so. Researchers have little idea what limits their enormous size. What is the pace of life at this scale, and what are the consequences of being so big?

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Why your generic drugs may not be safe and the FDA may be too lax

Photograph of capsules
Generic drugs can be a great way to save money, but a recent study shows there are risks involved. HQuality/Shutterstock.com

C. Michael White, University of Connecticut

Generic prescription drugs have saved the U.S. about US$1.7 trillion over the past decade. The Food and Drug Administration approved a record 781 new generics in 2018 alone, including generic versions of Cialis, Levitra and Lyrica. They join generic versions of blockbusters from yesteryear, like Lipitor, Nexium, Prozac and Xanax.

Seniors are the biggest purchasers of generics, because they take the most medications and are on fixed incomes, but virtually everyone has taken a generic antibiotic or pain pill at one time.

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Why it can be hard to stop eating even when you’re full: Some foods may be designed that way

Photograph of cookies
Bet you can’t eat just one. tlindsayg/Shutterstock

Tera Fazzino, University of Kansas and Kaitlyn Rohde, University of Kansas

All foods are not created equal. Most are palatable, or tasty to eat, which is helpful because we need to eat to survive. For example, a fresh apple is palatable to most people and provides vital nutrients and calories.

But certain foods, such as pizza, potato chips and chocolate chip cookies, are almost irresistible. They’re always in demand at parties, and they’re easy to keep eating, even when we are full.

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Global Storms on Mars Launch Dust Towers Into the Sky

Photograph of side by side images of Mars atmosphere
Side-by-side movies shows how the 2018 global dust storm enveloped the Red Planet, courtesy of the Mars Color Imager (MARCI) camera onboard NASA's Mars Reconnaissance Orbiter (MRO). This global dust storm caused NASA's Opportunity rover to lose contact with Earth. Credit: NASA/JPL-Caltech/MSSS

Republished from an article on JPL.NASA.gov – 11/26/2019

Dust storms are common on Mars. But every decade or so, something unpredictable happens: A series of runaway storms breaks out, covering the entire planet in a dusty haze.

Last year, a fleet of NASA spacecraft got a detailed look at the life cycle of the 2018 global dust storm that ended the Opportunity rover’s mission. And while scientists are still puzzling over the data, two papers recently shed new light on a phenomenon observed within the storm: dust towers, or concentrated clouds of dust that warm in sunlight and rise high into the air. Scientists think that dust-trapped water vapor may be riding them like an elevator to space, where solar radiation breaks apart their molecules. This might help explain how Mars’ water disappeared over billions of years.

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Permanent hair dye and straighteners may increase breast cancer risk

The study found that women who use permanent hair dye and chemical hair straighteners have a higher risk of developing breast cancer than women who don’t use these products. NIEHS

Scientists at the National Institutes of Health found that women who use permanent hair dye and chemical hair straighteners have a higher risk of developing breast cancer than women who don’t use these products. The study published online Dec. 4 in the International Journal of Cancer and suggests that breast cancer risk increased with more frequent use of these chemical hair products.

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SpaceX Dragon Heads to Space Station with NASA Science, Cargo

Photo of SpaceX-Dragon Rocket Launch
SpaceX launches its 19th cargo resupply mission to the International Space Station at 12:29 p.m. EST Dec. 5, 2019, from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida. Credits: NASA TV

Article Originally Published at NASA.gov 12/05/19

A SpaceX Dragon cargo spacecraft is on its way to the International Space Station after launching at 12:29 p.m. EST Thursday. Dragon will deliver more than 5,700 pounds of NASA cargo and science investigations, including studies of malting barley in microgravity, the spread of fire, and bone and muscle loss.

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Newly identified flu antibodies could improve vaccines and treatments

Illustration of a whole influenza virus
Illustration of a whole influenza virus with a light grey surface membrane and the virus’ surface proteins HA (light blue) and NA (dark blue). HA is comprised of three subunits, while NA is comprised of four. CDC / Dan Higgins

Original Publication: 11/05/2019 – National Institutes of Health

Each year, millions of people get influenza, or flu. During the 2017-2018 flu season, 959,000 people in the U.S. were hospitalized and 79,000 people died after catching the flu. The annual seasonal flu vaccine is currently the best way to protect against the viruses that cause flu.

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You can join the effort to expose Twitter bots

maxuser/Shutterstock.com

Pik-Mai Hui, Indiana University and Christopher Torres-Lugo, Indiana University

In the lead-up to the 2018 midterm elections, more than 10,000 automated Twitter accounts got caught conducting a coordinated campaign of tweets to discourage people from voting. These automated accounts may seem authentic to some, but a tool called Botometer was able to identify them while they pretentiously argued and agreed, for example, that “democratic men who vote drown out the voice of women.” We are part of the team that developed this tool that detects the bot accounts on social media.

Our next effort, called BotSlayer, is aimed at helping journalists and the general public spot these automated social media campaigns while they are happening.

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NASA Study Shows Human Activities Are Drying Out the Amazon

Photo of deforestation
Image by Rosario Xavier from Pixabay

Re-Published from JPL.NASA.gov – 12/5/2019

A new NASA study shows that over the last 20 years, the atmosphere above the Amazon rainforest has been drying out, increasing the demand for water and leaving ecosystems vulnerable to fires and drought. It also shows that this increase in dryness is primarily the result of human activities.

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New Satellite Will Track Rising Oceans Into 2030

Picture of NASA's new Satellite Jason-CS-Sentinel-6
Image Credit: IABG

This article is re-printed from an article on NASA.gov

Earth’s climate is changing, and the study of oceans is vital to understanding the effects of those changes on our future. For the first time, U.S and European agencies are preparing to launch a 10-year satellite mission to continue to study the clearest sign of global warming – rising sea levels. The Sentinel-6/Jason-CS mission (short for Jason-Continuity of Service), will be the longest-running mission dedicated to answering the question: How much will Earth’s oceans rise by 2030?

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