Did you know that until the 16th century, mariners and seamen referred to sharks as "sea dogs"? Sharks have actually been around for a long time--many scientists think a variation of the shark existed from over 420 million years ago! Sharks belong to a large group of fish that have a skeleton made of cartilage instead of bone. Because of this, the only fossilized remains of ancient sharks are their teeth.The teeth of sharks grow in constantly to replace older ones that wear out. It is estimated that sharks can lose up to 20,000 teeth in their lifetime. In fact, some ancient sharks had teeth that grew as long as 4 inches.
This necklace features one such authentic fossil, although considerably smaller than the prodigious fangs of ancient sharks. The fossil hangs from a metal coil attached to a fully adjustable cord that fits all sizes. Makes a great gift for the shark fan in your life, as well as an excellent stocking stuffer or party favor. Always a big hit with marine biology teachers.
Box of 100 X-LARGE nitrile exam gloves.
These disposable surgical-style earloop face masks conform to the ASTM F1862 Level 1 clasification. Box of 50.
This is a smart value 200 gloves box of Large Nitrile exam gloves.
High-protection, fluid-resistant and anti-static disposable lab coat in size Large.
Great exam quality Nitrile gloves in size SMALL.
High-protection, fluid-resistant and anti-static disposable lab coat in size Extra Large.
This classic device is used to demonstrate the conservation of mechanical energy.
The LCD Digital Microscope II is a professional biological microscope at an affordable price. Up to 1600X with digital zoom!
Defy gravity with this cool balancing eagle!
The Wimshurst Machine is a high quality static machine for student labs.
This magic bird defies gravity before your very eyes!
This is a classic demonstration toy of the powers of magnetic fields!
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