Door Bell

门铃

Mercy

一种游戏，首先喊出『Mercy』者为失败者

Mercy is a popular game of strength, skill and endurance in Britain, Canada, Pakistan, India, and the USA, among other countries. The game is played by two players who grasp each other's hands (with interlocked fingers). The aim is to twist the opponents hands or bend the fingers until the opponent surrenders.

https://www.youtube.com/watch?v=mg8VXSuSoPo

Arm wrestling

扳手腕

Arm wrestling involves two participants. Each places one arm on a surface with their elbows bent and touching the surface, and they grip each other's hand. The goal is to pin the other's arm onto the surface, the winner's arm over the loser's arm.

Stop motion

定格动画

Stop motion (hyphenated stop-motion when used as an adjective) is an animation technique that physically manipulates an object so that it appears to move on its own. The object is moved in small increments between individually photographed frames, creating the illusion of movement when the series of frames is played as a fast sequence. Dolls with movable joints or clay figures are often used in stop motion for their ease of repositioning. Stop motion animation using plasticine is called clay animation or "clay-mation". Not all stop motion requires figures or models; many stop motion films can involve using humans, household appliances and other things for comedic effect. Stop motion can also use sequential drawing in a similar manner to traditional animation, such as a flip book. Stop motion using objects is sometimes referred to as pixilation or object animation.

Teach For America

一家在美国颇具影响力的，致力于缩小教育差距的非盈利机构，在 Karim Abouelnaga 的《A summer school kids actually want to attend》 TED 分享中被提到

Teach For America (TFA) is a nonprofit organization whose stated mission is to "enlist, develop, and mobilize as many as possible of our nation's most promising future leaders to grow and strengthen the movement for educational equity and excellence." The organization aims to accomplish this by recruiting and selecting college graduates from top universities around the United States to serve as teachers. The selected members, known as "corps members," commit to teaching for at least two years in a public or public charter K–12 school in one of the 52 low-income communities that the organization serves.

Elo rating system

ELO等级分制度是指由匈牙利裔美国物理学家Arpad Elo创建的一个衡量各类对弈活动水平的评价方法，是当今对弈水平评估的公认的权威方法。被广泛用于国际象棋、围棋、足球、篮球等运动。网络游戏英雄联盟、魔兽世界内的竞技对战系统也采用此分级制度。

The Elo rating system is a method for calculating the relative skill levels of players in competitor-versus-competitor games such as chess. It is named after its creator Arpad Elo, a Hungarian-born American physics professor.

The Elo system was originally invented as an improved chess rating system, but is also used as a rating system for multiplayer competition in a number of video games, association football, American football, basketball, Major League Baseball, Scrabble and other games.