• Diseased Illegal Immigrants Aren’t “Invading” the United States

    My research at the Cato Institute on crime and terrorism committed by illegal immigrants conclusively shows that they commit less crime than native-born Americans and have murdered zero people in domestic attacks since 1975. We also fond no statistically significant relationship between the size of the immigrant population, the illegal immigrant population, or the legal immigrant population and the spread of serious communicable diseases.

  • How Ruhr University is Combatting Right-Wing Extremist Activities

    “The constitutional principles of freedom of opinion, which we seek to protect and defend, don’t allow people to be sanctioned because of their presumed beliefs. This also applies to neo-Nazis. However, we do not stand idly by”: Ruhr University Bochum’s vice rector.

  • Madison and Nashville School Shooters Appear to Have Crossed Paths in Online Extremist Communities

    A month after a student opened fire at Abundant Life Christian School, another killed a classmate at Antioch High School. Both were active in an internet subculture that glorifies mass shooters and encourages young people to commit attacks.

  • Antioch, Tenn., Shooter Inspired by Broad Extremist Beliefs and Previous Mass Killers

    On January 22, 2025, a 17-year-old student opened fire inside the cafeteria at Antioch High School in Nashville, Tennessee. The shooter subscribed to broad accelerationist beliefs, which hold that society is irrevocably broken and must be destroyed to be rebuilt.

  • Bystander Reporting Helps Prevent Mass Violence

    Bystander reporting’s role in mitigating mass violence deserves much more attention –because peers, bystanders, and “bystanders of bystanders” often know a lot about a person’s concerning behavior, and because they often choose not to report because they perceive authority figures are not receptive or are unlikely to be helpful.

  • 5 Israeli Innovations for Fighting Wildfires

    As regions from California to the Mediterranean face wildfire threats, these innovations can help win the battle against out-of-control flames.

  • Will Trump Spark a Mineral 'Gold Rush' in Greenland?

    The mineral wealth on the Arctic island of Greenland is in the global spotlight after U.S. President Donald Trump said he wants to take control of the territory from Denmark, prompting alarm from European allies.

  • Southport Attack: Changing the Definition of Terrorism Won’t Stop the Violence

    Axel Rudakubana, who killed of three young girls in Southport in a stabbing attack in 2024, had been referred to the Prevent counter-terrorism program three times, but failed to meet the threshold for intervention. Some want to change terror laws to deal with lone, violent killers. But as a researcher of counter-terrorism laws, I argue there is little point to widening what is already a broad definition of terrorism.

  • In Times of Crisis, States Have Few Tools to Fight Misinformation

    While officials in Southern California fought fire and falsehoods, Meta —the parent company of Facebook and Instagram —announced it would eliminate its fact-checking program in the name of free expression. As social media companies are pushing back against efforts to crack down on falsehoods, questions are asked about what, if anything, state governments can do to stop the spread of harmful lies and rumors that proliferate on social media.

  • House Democrat Pushes Bill Requiring Liability Policy to Buy or Possess Firearms

    Under a bill proposed Monday, the legislative majority is pushing to require proof of “financial responsibility” before purchasing or possessing a firearm by requiring certain liability policies.

  • Monitoring Space Traffic

    AeroAstro Ph.D. student Sydney Dolan uses an interdisciplinary approach to develop collision-avoidance algorithms for satellites.

  • Russia's Arctic Militarization Behind Trump's Focus on Greenland

    The United States has long viewed Greenland as vitally important for its defense. With Russia investing heavily in its Arctic military footprint in recent years, the importance of Greenland to the United States is increasing.

  • Proud Boys: A Big Tent for Hate

    Some of those pardoned by President Trump are leaders and members of the Proud Boys, a right-wing extremist group with a history of using violence, targeted harassment, and intimidation to achieve their political goals and combat perceived enemies – Jews, Muslims, gays, progressives, and feminists.

  • Acoustic Sensors Find Frequent Gunfire on School Walking Routes

    A new study used acoustic sensors that detect the sound of gunfire to show how often children in one Chicago neighborhood are exposed to gunshots while walking to and from school. The study documents toll on kids in the community.

  • The L.A. Fires Show a Need to Rethink Our Wildland Firefighting Systems

    As bad as the fires in the Los Angeles area have been—more than 12,000 structures burned, about 180,000 people evacuated, more than 35,000 acres scorched, and at least 25 deaths—they could have been even worse, but in some ways Angelenos got lucky. Asystem built on luck, however, is not a durable system. It is already strained, and it risks breaking down in a world of greater and more frequent wildfires.