Your eyes are pretty remarkable, and I'm not just saying that to be nice. You can see colors over an electromagnetic wavelength anywhere from 410 nanometers, here you'll find violet, to roughly 680 nanometers, the home of red.

1.  that 为指示代词“那件事情”，不是引导宾语从句的连词。to be nice 是目的状语“为了讨好你”。not 实际否定不定式。意思是：我那样说不是仅仅为了讨好你。

2.   anywhere 修饰前面的an electromagnetic wavelength，意为：任何地方的电磁波长。over 是“通过”。

3 .  from...to...表示范围跨度，作定语，修饰colors。