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2. Wheelchair - Wikipedia

   en.wikipedia.org/wiki/Wheelchair

   Where an ultra-lightweight manual chair may weigh under 10 kg, the largest outdoor power-chairs may weigh 200 kg or more. Smaller power chairs often have four wheels, with front or rear wheel drive, but large outdoor designs commonly have six wheels, with small wheels at front and rear and somewhat larger powered wheels in the centre.

3. Bicycle tire - Wikipedia

   en.wikipedia.org/wiki/Bicycle_tire

   New Mail Ladies Safety bicycle, circa 1891, with solid rubber tires A tubed, clincher tire showing the inner tube protruding between the tire and the rim Tubular tire rolled from rim to show glue between them Clincher cross section schematic with 1: rim, 2: rim strip, 3: rim braking surface, 4: bead core, 5: inner tube, 6: casing, 7: tread

4. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

5. Quadracycle - Wikipedia

   en.wikipedia.org/wiki/Quadracycle

   A tourist rental quadricycle: Quadricycle International Q-Cycle-6 [1] A Rhoades Car 4W2P 4-Wheel Bike parked on a Canadian urban street. A quadracycle (also spelled quadricycle) is a four-wheeled human-powered land vehicle.

6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.

7. Ultralight material - Wikipedia

   en.wikipedia.org/wiki/Ultralight_material

   Ultralight materials are solids with a density of less than 10 mg/cm 3, including silica aerogels, carbon nanotube aerogels, aerographite, metallic foams, polymeric foams, and metallic microlattices. The density of air is about 1.275 mg/cm 3 , which means that the air in the pores contributes significantly to the density of these materials in ...