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2. Black Friday (shopping) - Wikipedia

   en.wikipedia.org/wiki/Black_Friday_(shopping)

   Black Friday is the Friday after Thanksgiving in the United States.It traditionally marks the start of the Christmas shopping season in the United States. Many stores offer highly promoted sales at discounted prices and often open early, sometimes as early as midnight [2] or even on Thanksgiving.

3. Free shipping - Wikipedia

   en.wikipedia.org/wiki/Free_shipping

   This figure has been consistent for the last few years (ranging between 58% and 69%). Moreover, US respondents asked in the survey listed free shipping (54% mentions) as a most important factor for online shipping. Next in line were exclusive online deals (23%), no sales tax (10%), fast shipping (9%) and in store pickup (5%). [3]

4. 2022 in science - Wikipedia

   en.wikipedia.org/wiki/2022_in_science

   3 January: A free online index with metadata about over 200 million scientific documents is launched, OpenAlex. [1]The graphs show one visualization of recent developments of science overall based on this data (fewer papers may not be associated with decreasing success, priority, impact or activity).

5. Free particle - Wikipedia

   en.wikipedia.org/wiki/Free_particle

   A free particle with mass in non-relativistic quantum mechanics is described by the free Schrödinger equation: (,) = (,) where ψ is the wavefunction of the particle at position r and time t . The solution for a particle with momentum p or wave vector k , at angular frequency ω or energy E , is given by a complex plane wave :

6. Crisis in Venezuela - Wikipedia

   en.wikipedia.org/wiki/Crisis_in_Venezuela

   Top to bottom, left to right: Hundreds of Venezuelans wait to seal their passports at an Ecuadorian customs house; millions demonstrate during the Mother of All Marches in 2017; a man eating from garbage in Venezuela; empty store shelves from shortages; people queued to enter a store; Paola Ramírez, a student killed by colectivos [1] [2] [3] during the 2017 protests

7. Zero-coupon bond - Wikipedia

   en.wikipedia.org/wiki/Zero-coupon_bond

   Zero coupon bonds have a duration equal to the bond's time to maturity, which makes them sensitive to any changes in the interest rates. Investment banks or dealers may separate coupons from the principal of coupon bonds, which is known as the residue, so that different investors may receive the principal and each of the coupon payments.