For most of its history, Earth has existed in a greenhouse state—warm, ice-free, and rich in atmospheric carbon dioxide. The ...

The Ordovician-Silurian mass extinction event may have wiped out some 85 percent of species, including many of the invertebrates this period is known for ... curve to estimate that extinction rates of ...

Some kinds of plants need a cold period in order to flower and produce fruit or seeds for the following growing season. This process is called vernalization. Each species has a different ...

Scientists studied plant DNA to understand past extinctions. They found that warming climates increase competition, ...

Climate change and habitat destruction are driving species to extinction at an alarming rate. The impact extends across all ...

Excess gas before your period is a common symptom of premenstrual syndrome (PMS). Fluctuating hormones leading up to your period may affect the activity in your colon, leading to gas and other ...

Austenian high jinks, internet boyfriends in crisp tailoring, a royal romp featuring the daughter of two cinematic icons – the buzziest period dramas heading to big and small screens in 2025 have all ...

The acid growth theory states that the auxin-induced acidification of plant cell walls causes their expansion. A model now suggests that excessive acidification leads to growth inhibition ...

CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise.

Feb. 6, 2025 — A study has identified key genetic pathways in corn that help its roots branch out to find water in soil; the varieties adapted to temperate regions like the U.S. corn belt showed ...

Late or missed menstrual period Late period: 5 or more days late compared to normal menstrual cycle Missed period: no menstrual flow for more than 6 weeks Teen not using any birth control that stops ...

Bears are omnivorous, eating both plant and animal matter ... They reach maximum fertility during a 3 to 5-day period, though their cycle lasts several weeks. They typically give birth to only one ...