holymoleculesbatman:

An example of intermolecular hydrogen bonding in a self-assembled dimer complex reported by Meijer and coworkers.The hydrogen bonds are the dotted lines.

A hydrogen bond is the attractive interaction of a hydrogen atom with an electronegative atom, such as nitrogen, oxygen or fluorine, that comes from another molecule or chemical group. The hydrogen must be covalently bonded to another electronegative atom to create the bond. These bonds can occur between molecules (intermolecularly), or within different parts of a single molecule (intramolecularly). The hydrogen bond (5 to 30 kJ/mole) is stronger than a van der Waals interaction, but weaker than covalent or ionic bonds. This type of bond occurs in both inorganic molecules such as water and organic molecules like DNA. 

staceythinx:

The Best Night-Sky Pictures of 2012 were named in the Third International Earth and Sky Photo Contest. National Geographic has assembled the winners into a spectacular slideshow.

staceythinx:

Leaf Carving: An Incredible New Art Form

vivienne-kensington:

pearlonthebarricade:

nevertrustasombrero:

consulting-god-of-mischief:

londonrains:

pernillo:

akanasan:

tessiethecreep:

captainlonglake:

vriskas-ochinchin:

youarethebutt:

livinglovinoloca:

razzledazzy:

tacoempress:

You read 249 words per minute.

That makes you 0% faster than the national average.

Hm…

You read 679 words per minute.

That makes you 172% faster than the national average.

I could have read faster but I’m lazy.

You read 1,203 words per minute

That makes you 381% faster than the national average

1500 words is the speed reader level? Aw, damn!

You read 368 words per minute.
That makes you 47% faster than the national average.
yuupp 

You read 171 words per minute.
That makes you 32% slower than the national average.

PFFFFFF SHIT I’M LITERALLY MENTALLY RETARDED

You read 327 words per minute.

That makes you 31% faster than the national average.

IM NOT EVEN ENGLISH

You read 408 words per minute.

That makes you 63% faster than the national average.

And English is my second language..

You read 194 words per minute.

That makes you 22% slower than the national average

okay..

You read 284 words per minute.
That makes you 14% faster than the national average.

Ok, and that’s in another language. So…It’s good, yea?

You read 578 words per minute. That makes you 131% faster than the national average.

HA! I knew what the text fragment was from and I had read the book! so I passed the test. LOL

You read 409 words per minute.
That makes you 64% faster than the national average.

awesome :3

You read 333 words per minute.
That makes you 33% faster than the national average.

I see a lot of 3’s, so it must be good

You read 704 words per minute.
That makes you 182% faster than the national average.

Awesomesauce :3

You read 205 words per minute.
That makes you 18% slower than the national average.

Oh okay….. You guys should see me trying to read aloud. I’m terrible at reading aloud.

You read 454 words per minute.
That makes you 82% faster than the national average.

You read 672 words per minute.  That makes you 169% faster than the national average.

sciencejokes:

askinnyblackman:

Get it because it’s a CELL WALL

HA

http://sciencejokes.tumblr.com

(Source: buttsbutts)

ilovecharts:

How A Book Is Born

ap-problems:

Submitted by Anon

sciencejokes:

jtotheizzoe:

wnycradiolab:

kqedscience:

The atom ukulele!

So dorky!  So good!

Atomic formula AlOHa.

(Element 105  … yeah, Hahnium … sometimes you gotta make a stretch)

http://sciencejokes.tumblr.com