bloatshock

nybg:

And so my dream of seeing a redwood as tall as the Burj Khalifa comes to a disappointing end. Still, the science behind the limitation is a pleasantly interesting consolation prize. —MN

science-junkie:

Why trees can’t grow taller than 100 metres

TYPICALLY, the taller the tree, the smaller its leaves. The mathematical explanation for this phenomenon, it turns out, also sets a limit on how tall trees can grow.

Kaare Jensen of Harvard University and Maciej Zwieniecki of the University of California, Davis, compared 1925 tree species, with leaves ranging from a few millimetres to over 1 metre long, and found that leaf size varied most in relatively short trees.

Jensen thinks the explanation lies in the plant’s circulatory system. Sugars produced in leaves diffuse through a network of tube-shaped cells called the phloem. Sugars accelerate as they move, so the bigger the leaves the faster they reach the rest of the plant. But the phloem in stems, branches and the trunk acts as a bottleneck. There comes a point when it becomes a waste of energy for leaves to grow any bigger. Tall trees hit this limit when their leaves are still small, because sugars have to move through so much trunk to get to the roots, creating a bigger bottleneck.

Jensen’s equations describing the relationship show that as trees get taller, unusually large or small leaves both cease to be viable (Physical Review Letters, doi.org/j6n). The range of leaf sizes narrows and at around 100 m tall, the upper limit matches the lower limit. Above that, it seems, trees can’t build a viable leaf. Which could explain why California’s tallest redwoods max out at 115.6 m.

Source: New Scientist.
Images: 1 - 2 - 3 - 4

faitherinhicks:

unicorn-brigade:

My first thought after seeing the new legendary pokemon. YES.

YES.

faitherinhicks:

unicorn-brigade:

My first thought after seeing the new legendary pokemon. YES.

YES.

undeadteds:

This Valentine UndeadTed has torn his own heart out and wants you to have it. How sweet. £59. Shipping is free in the UK. [LINK]  SOLD

undeadteds:

This Valentine UndeadTed has torn his own heart out and wants you to have it. How sweet. £59. Shipping is free in the UK. [LINKSOLD

(Source: undeadteds.com)

faitherinhicks:

unicorn-brigade:

My first thought after seeing the new legendary pokemon. YES.

YES.

faitherinhicks:

unicorn-brigade:

My first thought after seeing the new legendary pokemon. YES.

YES.

faitherinhicks:

unicorn-brigade:

My first thought after seeing the new legendary pokemon. YES.

YES.

faitherinhicks:

unicorn-brigade:

My first thought after seeing the new legendary pokemon. YES.

YES.

A Letter To The President: “My Husband Is Not the ‘Bigger Fish to Fry’ in Your Drug War”

letterstomycountry:

Via HuffPo:

President Barack Obama
The White House
1600 Pennsylvania Avenue, NW
Washington, DC 20500

Dear Mr. President:

I am writing to you as a wife and mother of two young daughters, whose 34-year old husband, Matthew Davies, faces 10 years or more in federal prison for providing medical marijuana to sick people in California, even though he complied with state law concerning medicinal cannabis. My questions to you are simple:

  • What has my husband done that would justify the federal government forcing my young daughters to grow up without a father?
  • How can your Administration ignore the will of the California people and prosecute this good, law-abiding man for doing exactly what state law permits?

Read More

lizclimo:

panda whale 
exclusive comic for the fluffington post

lizclimo:

panda whale 

exclusive comic for the fluffington post