By Nala Rogers, Inside Science -- When do you need a broadsword, and when would you be better off with a dagger? That's the question that faced artiodactyls, the group of mammals that includes deer, antelope, goats, giraffes, pigs, buffalo and cows, during their evolution.

Though anaphylaxis is rare, you are more likely to be murdered this Thanksgiving than die from a food allergy, companies and schools are increasingly buying epinephrine auto-injectors (EpiPens), which has led to shortages (government approval policies make it difficult for competitors to enter the market) and thus high costs. Though rare, the consequences of anaphylaxis are high, much more severe than using it when it might not be necessary.

If you are one of the millions of people in the U.S. who now carries an epinephrine auto injector (EAI) you probably wondered if it will still work if it freezes this winter. It will, according to new research being presented at the American College of Allergy, Asthma and Immunology (ACAAI) Annual Scientific Meeting.

As I mentioned in yesterday's post, there is a workshop going on this week at Fermilab, where 110 attendees - mostly particle physicists, but some computer scientists are also present - discuss how to push for more effective use of machine learning tools in the extraction of information on particle collisions. 

Also one goal is to understand what new ideas from the world of machine learning could find ideal applications in the typical use cases of research in fundamental physics. Here I wish to mention a few interesting things that I heard at the workshop so far, in random order. I will rarely make direct reference to the talks, to encourage you to dig into the pdf files available here.

As I write this, our local school is closed due to concern about smoke inhalation. Other parts of the nation may not realize it but two severe wildfires broke out recently, in northern and southern California. If this had happened anywhere near New York City or Washington, D.C. it would be called Smokemageddon, or a Particulate Vortex, or something else clever, but because it's California we won't get Lester Holt in a facemask and 24 hour coverage on CNN.

I flew to the US yesterday to get to Fermilab, where I am following a workshop titled Machine learning for jet physics". My goal of this post is to explain what this is about in general terms, such that if I have enough stamina I will give, in follow-ups to it, a few examples of the status of this interesting research activity, which encompasses particle physics and computer science and can provide spin-offs in a number of related areas of fundamental research.

A pilot study in Development and Psychopathology concluded that teenage girls who engage in self-harm like cutting often have brain features like adults with borderline personality disorder. Often is relative, since this was only 40 individuals.

Cutting and other forms of self-harm are warning signs for suicide, which data from the Centers for Disease Control and Prevention say increased 300 percent among 10- to 14-year-old girls from 1999 to 2014, according to data from the Centers for Disease Control and Prevention. During that same time, along with a 53 percent increase in suicide in older teen girls and young women.

Dams keep the boom and bust of flooding from being too severe, they prevent water shortages, they make human existence better. But they clearly change nature.

Why is a human building a dam unnatural but a beaver building a dam natural? Only an environmentalist can figure that out, but what was a great idea 10 years ago - hydroelectric power and storing water - is now the enemy of the paid activism community, and politically sympathetic researchers have increasingly begun to curry media attention by writing papers to prove them right, as has happened again in Nature Sustainability, a journal which, like something might be called Nature UFOs, was created to make money legitimizing the beliefs of the activism community inside academia.

In late 2014 I came downstairs from my home office and said to my wife, "Herb London just left me a message."

"Is he any relation to Stacy London?" she asked in her offhand humor way. Well, yeah, she is his daughter, if you are from California, but if you are of my generation and from anywhere near the orbit of New York, you know who Herb London is. And Herb London was getting a return phone call.

A new study in Nature Communications suggests that climate change could pose a threat to male fertility by increasing the number and severity of heat waves which damage sperm.

The authors contend that climate change is already having an impact on species populations, including climate-related extinctions in recent years. The authors suggest that sperm function is an especially sensitive trait. Sperm function is essential for reproduction and population viability, and so they sound a warning that biodiversity is already collapsing.

An exciting new class of potential inhibitors of both Alzheimer’s disease and Parkinson’s disease has been isolated from coffee.

Dr. Donald Weaver, co-director of the Kembril Brain Institute in Toronto, Canada explains: “The consumption of coffee seems to have a correlation to a decreased risk of developing Alzeimer’s disease and/or Parkinson’s disease”.

Their investigations have recently been reported in the journal Frontiers in Neuroscience. Among the results: Three types of coffee were investigated: caffeinated dark roast, caffeinated light roast, and decaffeinated dark roast.