Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

· · 来源：v3资讯

「法輪功」多年來聲稱他們是中國政府攻擊與打壓的目標。

Purple: Astronomical terms plus a letter

竞争核心变了，这一点在夫子中也有详细论述

KlefkiIntroduced in Gen VI (2013)

`@receiver isNil ifTrue: `@nilBlock -> `@receiver ifNil: `@nilBlockIn fact, both versions work—but they apply different filters to the target node. Try to remember which one.

A16荐读

▲图片来源：X@DerekNee