ScienceIQ.com

When Motherhood Means More than One

These days, twins, triplets, and other multiple births are becoming more common, but how do they happen? Fraternal twins (or triplets, quadruplets, or more) develop when two or more eggs are fertilized by two or more sperm. This can happen when the ovaries release more than a single mature egg. These are essentially separate pregnancies, although ...

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MotherhoodMeansMoreOne
Geology

Who Named The Cloud Types?

Clouds held a particular fascination for a young Englishman named Luke Howard (1773-1864). His father had sent him to grammar school at Burford, a village to the west of London. But Luke was more ... Continue reading

WhoNamedTheCloudTypes
Biology

New Ideas About An Old Puzzle

There's a familiar way of talking about language as a 'tool,' but of course that's just a metaphor. Literal tools made of rock can last for millennia as evidence of the skills of early humans. Not so ... Continue reading

NewIdeasAboutAnOldPuzzle
Medicine

What is Headache?

When a person has a headache, several areas of the head can hurt, including a network of nerves that extends over the scalp and certain nerves in the face, mouth, and throat. The muscles of the head ... Continue reading

WhatisHeadache
Chemistry

What Is pH?

Anyone who is the least bit familiar with vinegar, nausea, sodium bicarbonate, and ammonia-based cleaning solutions probably has a very good 'feel' for the different natures of acidic and basic ... Continue reading

WhatIspH

Lionfish Invasion

LionfishInvasionLionfish (Pterois volitans/miles complex) are beautiful, yet venomous, coral reef fish from Indian and western Pacific oceans that have invaded East Coast waters. Ironically, this species of lionfish is popular in large saltwater aquariums because of its brilliant maroon and white stripes and fan-like fins. However, beneath the fin's delicate exterior are venomous spines that are probably used for protection against predators.

Along the southeast United States, adult lionfish have been found at depths of 85 to 300 feet from Florida to North Carolina. Juvenile lionfish have also been observed in North Carolina, Bermuda and as far north as New York. NOAA scientists conclude that the large number of adults observed and the occurrence of juveniles indicates that lionfish are established and reproducing in coastal waters along the southeast United States. Furthermore, there is evidence that lionfish numbers are increasing.

Lionfish were likely first introduced off the Florida coast in the early to mid-1990s by intentional or unintentional release from the aquarium trade, including amateur home aquariums. There is no evidence suggesting that these lionfish derived from other common invasive species sources, such as ballast water dumping from the shipping industry, live-bait use by anglers or fouling on recreational boat hulls or semi-submersible oil platforms. Although it's still too early to predict the impact lionfish will have on the Atlantic coast, the damaging impacts of other invasive species have already left their mark on too many of the nation's valuable coastal ecosystems.