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¿Puedes nombrar todos estos presidentes de México?
play.howstuffworks.com/quiz/can-you-name-all-of-mexicos-heads-of-state
¡Este es un reto para todos los expertos en historia de México! ¿Crees que puedes nombrar 40 presidentes mexicanos con solo ver su foto? Si es así, nos dejarás con la boca abierta.
How Fuel Processors Work
auto.howstuffworks.com/fuel-efficiency/fuel-consumption/fuel-processor.htm
Hydrogen gas is hard to store, so fuel processors are crucial to most commercial fuel cells. Learn how fuel processors supply the hydrogen and how efficient they really are.
How Windshield Wipers Work
auto.howstuffworks.com/wiper.htm
What began as a hand-cranked system is now automatic, and only getting more so: Some windshield wipers can actually sense rain. Learn the mechanincs behind this essential automotive tool.
Can we make tailpipes that capture CO2?
auto.howstuffworks.com/tailpipe-capture-co2.htm
Tailpipes that capture CO2 would make a dent in humans' contributions to greenhouse gas emissions. Learn about tailpipes that capture CO2 and if they exist.
Which Is More Environmentally Friendly: Paper or Plastic?
science.howstuffworks.com/environmental/green-science/paper-plastic.htm
People wonder if paper or plastic bags are more environmentally friendly. Get the skinny on whether paper or plastic bags are greener.
Knight
history.howstuffworks.com/european-history/knights.htm
Knights, in the Middle Ages, were warrior horsemen. A knight was called Sir, and was usually of a noble or a genteel family.
What Does 'BPA Free' Mean and Why Does It Matter?
science.howstuffworks.com/environmental/green-science/bpa.htm
The chemical BPA (bisphenol-a) often found in consumer goods, may be linked to human health problems. Learn more about BPA in polycarbonate plastics.
Could radiant floor heating systems be related to some cancers?
home.howstuffworks.com/home-improvement/home-diy/flooring/radiant-floor-heating-cancer.htm
Some people wonder if radiant floor heating systems could be related to some cancers. Find out if radiant floor heating is related to some cancers.
What's the difference between a seal and a sea lion?
animals.howstuffworks.com/mammals/seal-versus-sea-lion.htm
The difference between seals and sea lions is easy to spot once you know what to look for. Learn about the difference between seals and sea lions.
Could Salter's Duck have solved the oil crisis?
science.howstuffworks.com/environmental/green-science/salters-duck.htm
Salter's Duck was a 1970s wave energy invention that lost grant money and fell by the wayside. Find out more about Salter's Duck's energy potential.