Ship – any large buoyant watercraft. Ships are generally distinguished from boats based on size and cargo or passenger capacity. … More

Semi-trailer truck – a large vehicle that consists of a towing engine, known as a tractor or truck, attached to … More

Sewing machine – machine used to stitch fabric and other materials together with thread. Sewing machines were invented during the … More

Screw – one of the six simple machines. Screw: An inclined plane wrapped around a shaft or cylinder. This inclined … More

Seawall – a form of coastal defense constructed where the sea, and associated coastal processes, impact directly upon the landforms … More

Seat Belts Mean Safety Seat belts have been keeping people safe in cars for more than fifty years. The best … More

self-driving cars fully autonomous car self-driving cars – news, updates drivers want… – drivers and passengers want mainstream features that … More

Scissors – Who invented scissors? What were early scissors made of? Is there more than one type of scissors? Scissors … More

Human waste – everybody poops. Sanitation toilets human waste safe drinking water water for cooking, bathing disposal of waste water … More

Pictured: A GOES-13 satellite image captured at 17:45 UTC on January 2, 2014, depicting an ongoing blizzard across portions of … More

Behind every successful science discovery, there is an engineer. For really big science projects, like the NASA Space Program, thousands … More

San Francisco Cable cars are the only mobile National Monuments. A third of commuters in San Francisco use public transportation … More

Sailboat – a boat propelled partly or entirely by sails. The generic term covers a variety of boats, larger than … More