Painted ladies are the ultramarathoners of the butterfly world—even more so than monarchs. Scientists have long known about ...

Guest Join our daily and weekly newsletters for the latest updates and exclusive content on industry-leading AI coverage. Learn More Intelligence is pervasive, yet its measurement seems subjective. At ...

HIV is the virus that causes AIDS. It damages your immune system, making it easier for you to get sick. HIV is spread during sex, but condoms can help protect you. For more accurate abortion options, ...