“This document is little more than an optical illusion,” India’s delegate Chandni Raina said. Sierra Leone’s Environment Minister Jiwoh Abdulai said the deal showed a “lack of goodwill ...

Think you’ve got the sharp ... or pen on the screen. Have you solved it? If you haven’t, don’t worry! This puzzle is tricky and designed to stump even the brightest. Check the solution below to see if ...

记者11月21日从中国煤炭科工集团（以下简称中国煤科）获悉，该集团所属煤炭科学技术研究院有限公司（以下简称煤科院）聚萘二甲酸二甲酯（PEN）单体年百吨级中试项目，日前正式步入落地实施阶段。这是国内首个煤基PEN材料单体百吨级中试装置。该中试实验 ...

Those who do can brag about their razor-sharp vision and high IQ. Cracking this optical illusion will take ... It might be easier if you have a pen and paper to hand so you don't confuse yourself.