I recommend the following BBC documentaries:
1. Brain Story
2. The Human Mind
3. The Human Body
4. The Human Face
5. Human Instinct
6. Human Senses
— Me@2013-01-31 10:14:26 AM
2013.01.31 Thursday (c) All rights reserved by ACHK
I recommend the following BBC documentaries:
1. Brain Story
2. The Human Mind
3. The Human Body
4. The Human Face
5. Human Instinct
6. Human Senses
— Me@2013-01-31 10:14:26 AM
2013.01.31 Thursday (c) All rights reserved by ACHK
Another sort of false prayers are our regrets. Discontent is the want of self-reliance: it is infirmity of will. Regret calamities, if you can thereby help the sufferer; if not, attend your own work, and already the evil begins to be repaired.
— Emerson
.
.
2008.03.11 Tuesday CHK2
這段改編自 2010 年 4 月 3 日的對話。
Young man, in mathematics you don’t understand things. You just get used to them.
— John von Neumann
數學之中,越基礎的內容,有時會越難解釋。那些基礎內容,我們有時會以為自己明白。那只是因為,我們已經習慣了那些東西。「習慣」冒充了「明白」的感覺。例如,「3 乘以 2」 是什麼意思?
(安:「3 乘以 2」即是有兩個 3 加在一起,所以是 6。
3 x 2 = 3 + 3 = 6
)
無錯。那「3 乘以 2.1」 呢?何謂「有 2.1 個 3 加在一起」?
3 x 2.1 = ?
(安:我們可以把「3 乘以 2.1」,看成有三個 2.1 加在一起:
3 x 2.1
= 2.1 x 3
= 2.1 + 2.1 + 2.1
= 6.3
)
都可以。那樣,「3.1 乘以 2.1」呢?
— Me@2013.01.30
2013.01.31 Thursday (c) All rights reserved by ACHK