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This means these three values can’t be independent; if you know two of them, you can derive the third. How do physicists deal with this? We define the speed of light as exactly 299,792,458 meters per second. (How do we know it’s exact? Because we define a meter as the distance light travels in 1/299,792,458…
Compare Our Top Picks More Sound Machines We Like Baby Brezza Sleep and Soother for $30: This is super light, can run on batteries or be plugged in, and has 18 sleep sounds and three timer options (or it plays continuously). There’s also a night light with three brightness levels. Yogasleep Hushh 2 Portable Sound…
FAQS We tested and recommend all of the heart rate monitors below, which do a pretty impeccable job. But what do all these terms mean? Heart rate zones: If someone tells you they’ve been doing 80/20 training, they’ve been doing heart rate zone-based workouts. Heart rate zones are an easy way to break down your…
Top 4 360 Cameras Compared Other Options Photograph: Scott Gilbertson Insta360 X3 for $250: You’ll have to settle for 5.7K footage here, and that’s on a 1/2-inch sensor, which is only 1080p when you crop to a rectangular video format. Still, you get nearly the same form factor as the X4, and you can use…
The short answer is price, performance, and usability. Most regular folks who ask me about a new TV are looking for something around $500 or less. Jumping up a few hundred dollars can often get you a lot more performance, but I understand that may not be in the budget, so this list generally aims…
The Nintendo 64 was a fantastic console, home to generation-defining games such as Super Mario 64 and GoldenEye 007. With its four built-in controller ports, it revolutionized multiplayer gaming in front of the TV, and it was the first mainstream console to introduce an analog stick, essential for navigating the burgeoning 3D worlds the medium…
The original version of this story appeared in Quanta Magazine. We were once promised self-driving cars and robot maids. Instead, we’ve seen the rise of artificial intelligence systems that can beat us in chess, analyze huge reams of text, and compose sonnets. This has been one of the great surprises of the modern era: physical…
If you don’t know where to start—and use—your HP coupon code, there’s a wide variety of options available at HP.com in terms of budget and use case, but my eye goes first to the high-end HP Omen gaming monitors, like the fantastic HP Omen Transcend 32. This 4K 240Hz monitor is a favorite among PC…
The Earth is constantly receiving space signals that contain vital information about extremely energetic phenomena. Among the most peculiar are brief pulses of extremely high-energy radio waves, known as fast radio bursts (FRB). Astronomers compare them to a powerful lighthouse that shines for milliseconds in the middle of a rough, distant sea. Detecting one of…
“I’m looking over my shoulder driving home,” a doctor whose hospital was targeted by a subpoena told the Post. Homeland Security Secretary Kristi Noem has temporarily moved into secure military housing after the location of her Washington, DC apartment was exposed online, triggering what DHS called “vicious doxxing” and a wave of death threats, the…
