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A paper cup is a disposable cup made out of paper and often lined or coated with plastic [1] [2] or wax to prevent liquid from leaking out or soaking through the paper. [3] [4] Disposable cups in shared environments have become more common for hygienic reasons after the advent of the germ theory of disease.
A science fair or engineering fair is an event hosted by a school that offers students the opportunity to experience the practices of science and engineering for themselves. In the United States, the Next Generation Science Standards makes experiencing the practices of science and engineering one of the three pillars of science education.
The disposable cone-shaped paper cup was invented in 1908 by Lawrence Luellen, and in 1912 Luellen and Hugh Moore began marketing the Health Kup, another paper disposable cup. [8] The Health Kup was designed to create a means for people to drink water from public water barrels without spreading germs, which occurred when people would use a ...
Sunflowers do not always point to the Sun. Flowering sunflowers face a fixed direction (often east) all day long, but do not necessarily face the Sun. [123] However, in an earlier developmental stage, before the appearance of flower heads, the immature buds do track the Sun (a phenomenon called heliotropism). Mature flowers face east. [124]
Solvents are used to remove organic residues that soap cannot remove, and inorganic residues that do not dissolve in water can often be dissolved with a dilute acid. When cleaning is finished it is common practice to rinse glassware multiple times, often finally with deionised water , before suspending it upside down on drying racks. [ 14 ]
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The Google Science Fair was a worldwide (excluding Cuba, Iran, North Korea, Sudan, Myanmar/Burma, Syria, Zimbabwe and any other U.S. sanctioned country [1]) online science competition sponsored by Google, Lego, Virgin Galactic, National Geographic and Scientific American. [2] [3] [4] It was an annual event spanning the years 2011 through 2018.
As is the case for disposable cups, materials used are usually paper, plastic (including expanded polystyrene foam), or plastic-coated paper. Recycling rates are especially low for paper-based products, especially when soiled with (wet and / or oily) scraps due to diminished recyclate quality.