References

These are the best walking treadmills you can buy in every category, from Mobvoi Home Treadmill to Bluefin Fitness Task 2.0 Treadmill.

BUYING GUIDE These are the best air purifiers for allergies you can buy in every category, from Levoit Core 600S and GermGuardian AC4825E to RabbitAir A3.

Qubits are the fundamental building blocks of quantum computers — and, when fitted into these machines — rely on the weird laws of quantum mechanics to process calculations in parallel.

Buying Guide These are the best humidifiers you can buy in every category, from Dyson AM10 and Levoit LV600HH to HoMedics TotalComfort Deluxe.

BUYING GUIDE These are the best air purifiers you can buy in every category, from Levoit Core 600S and BlueAir Blue Pure 411i Max to Dyson Purifier Cool.

BUYING GUIDE These are the best dehumidifiers you can buy in every category, from Honeywell TP50WK to LG Puricare.

REFERENCE Wolf spiders are a large family of hairy and athletic arachnids that chase down prey on the ground rather than catching food in webs.

With the rise of AI models and automated bots, we find out whether there is any weight to the idea that the internet is now mostly dominated by machines or if it’s still a human hangout.

Buying Guide These are the best fitness trackers you can buy in every category, from Apple Watch Series 8 and Garmin Fenix 7 to Amazfit Balance.

BUYING GUIDE The best running watches to track performance whether you’re a serious runner or enjoy a more relaxed jog, we have running watches to help you meet your fitness goals.

Reference Tardigrades, often called water bears or moss piglets, are near-microscopic animals that are extremely resilient.

If you’re in the market for new gear to support your rock-hunting hobby, check out our list of the best rock tumblers.

Buying Guide These are the best exercise bikes you can buy in every category, from Peloton Bike and YOSUDA Bike to Schwinn IC4.

BUYING GUIDE These are the best exercise machines to lose weight, from the NordicTrack X22i treadmill to the Peloton bike.

BUYING GUIDE These are the best cycling shoes in each category, from Peloton and Shimano RC1 to Giro Regime.

Buyers guide These are the best running shoes for supination you can buy in every category, from Saucony Ride 16 and Brooks Glycerin 20 to Hoka Mach X.

Use the best binoculars to hunt for wildlife, stargaze, track athletes or spot planes — find something to suit any budget, interest or experience level.

The best binoculars for kids need to be lightweight, compact and easy to hold and use — we've rounded up our favorite models for kids young and old.

BUYING GUIDE The best star projectors transform your home into a mesmerizing, other-worldly space — whether you want to sleep under the stars or learn more about astronomy.

reference Centrifugal and centripetal are two closely related forces that describe circular motion, but the meanings are often mixed up.