wu ka chun

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用十分鐘瞭解 《單晶片、機器人與電子元件》(Arduino + Raspberry Pi)

轉不停陀螺的奧秘

文/陳義勳,台北市立教育大學科學教育碩士學位學程<p>旋轉是物理學上的一個重要單元,日常生活中,陀螺的旋轉因受外在阻力影響下,經過一段時間是會停止的。但理想情況下(亦即在無其他外在阻力下)依角動量守衡原理,陀螺是會不停地以等角速度旋轉,但在日常生活當中,如何使陀螺轉個不停呢?<p>依角動能守恆原理、能量守恆原理 …

8 Fascinating Things We Learned About The Mind In 2015

Memory erasing is just the beginning.<p>As the New Horizons spacecraft made its historic flight to Pluto and some scientists explored the far reaches of our solar system, others were making some incredible advances in their exploration of the inner workings of the mind.<p>Studies published this year shed …

宇宙大霹靂的發現--《相對論百年故事》

你有冇中招?日本調查最易早死 5 大職業及 10 大生活習慣

<b>讚好此文:</b><p>十月 13, 2015 •科技趣聞 •<p>出得來社會搵食,想找到一份輕鬆的工作從來不是一件容易的事,而且在香港這個生活節奏急速的都市更是更加困難。正因如此,現代人在工作上所面對的壓力已越來越大,太過辛勞的話甚至會可能猝死。至於做哪一種職業的人會最容易早死呢?最近日本一個節目就進行了相關調查。<p>相 …

物質結構與鍊金術——阿宅物理(3)

先前,人稱(?)物理界蔡頭的大抖宅,向大家介紹了反物質的箇中奧妙,卻也帶出讓人困惑的問題:為何宇宙中的反物質這麼稀少?物理學家因此提出許多理論,試圖揭開這個謎底。<p>然而,組成物質與反物質的粒子其實相當多樣,特性亦不相同;於是,物質比反物質多的現象,也可能隨著粒子種類的區分而有不同因素,如果不追根究柢, …

6 Sleep Habits Of Productive People

For starters: They don’t need alarm clocks, stick to their bedtimes, and don’t sleep with their smartphones.<p><i>Editor’s Note: This article is one of the top 10 habits to adopt to be better at your job in 2016. See the full list here.</i><p>You may feel super productive by pulling all nighters, but you’re …

機艙裡的空氣很髒嗎?-《機艙機密》

「總有一些事,讓你一夜長大;總有一個人,讓你一生感謝。」 -電影《歡迎來到布達佩斯大飯店》,榮獲奧斯卡多項大獎 #設計改變世界 Photo Credit / Sogi World

Comet Flies By Mars Today in Rare Encounter: Watch It Online

<b>Editor's Update for 4 p.m. ET:</b> Comet Siding Spring has completed its close Mars flyby. See our latest story on the epic encounter here: Comet Buzzes …