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2. 420 (cannabis culture) - Wikipedia

   en.wikipedia.org/wiki/420_(cannabis_culture)

   420, 4:20 or 4/20 (pronounced four-twenty) is cannabis culture slang for marijuana and hashish consumption, especially smoking around the time 4:20 p.m. (16:20). It also refers to cannabis -oriented celebrations that take place annually on April 20 (4/20 in U.S. date form).

3. Where to shop today's best sales: 25% off an iPad, 20% off ...

   www.aol.com/lifestyle/where-to-shop-todays-best...

   It's also on sale for its lowest price ever at 25% off. One happy ... now 20% off at Sur La Table. ... This cute, comfy knit top is really on sale for just $40 (30% off!). It has an oversized fit ...

4. Burqa by country - Wikipedia

   en.wikipedia.org/wiki/Burqa_by_country

   The burqa is worn by women in various countries. Some countries have banned it in government offices, schools, or in public places and streets. There are currently 16 states that have banned the burqa and niqab, both Muslim-majority countries and non-Muslim countries, including Tunisia, [1] Austria, Denmark, France, Belgium, Tajikistan, Uzbekistan, Bulgaria, [2] Cameroon, Chad, the Republic of ...

5. Thermal expansion - Wikipedia

   en.wikipedia.org/wiki/Thermal_expansion

   A number of materials contract on heating within certain temperature ranges; this is usually called negative thermal expansion, rather than "thermal contraction".For example, the coefficient of thermal expansion of water drops to zero as it is cooled to 3.983 °C (39.169 °F) and then becomes negative below this temperature; this means that water has a maximum density at this temperature, and ...

6. Electrical resistivity and conductivity - Wikipedia

   en.wikipedia.org/wiki/Electrical_resistivity_and...

   One: all gas particles behave in a similar way, influenced by gravity and by collisions with one another. Two or three: electrons , ions , protons and neutrons can be distinguished by the sign and value of their charge so that they behave independently in many circumstances, with different bulk velocities and temperatures, allowing phenomena ...

7. Gamma-ray burst - Wikipedia

   en.wikipedia.org/wiki/Gamma-ray_burst

   The observation of minutes to hours of X-ray flashes after a short gamma-ray burst is consistent with small particles of a primary object like a neutron star initially swallowed by a black hole in less than two seconds, followed by some hours of lesser energy events, as remaining fragments of tidally disrupted neutron star material (no longer ...