and hour and a half in sai later, i produce drawing of an anime character i i know nothing about. i do not watch sailor moon. ??????
THIS IS WHAT A WORLD LEADER LOOKS LIKE.
DESMOND TUTU, I OFFICIALLY LOVE YOU.
"I would refuse to go to a homophobic heaven. No, I would say sorry, I mean I would much rather go to the other place," Archbishop Tutu said at the launch of the Free and Equal campaign in Cape Town.
"I would not worship a God who is homophobic and that is how deeply I feel about this."
Archbishop Tutu said the campaign against homophobia was similar to the campaign waged against racism in South Africa.
"I am as passionate about this campaign as I ever was about apartheid. For me, it is at the same level," he added.
[source: BBC News]
As an artist, you’ll have to draw turned heads countless times. But when the head is turned, drawing the far eye poses a special challenge. This is because we must foreshorten that eye more than we’re used to, and because we’re tempted to shape it like the near eye, which is less foreshortened. Therefore, it’s useful to practice drawing the far eye by itself, without the near eye to throw you off. Print these sheets, draw the eyes, and you’ll save yourself great difficulty later.
Note that all of these eyes are facing our left. You’ll need to practice right-facing eyes as well, so flop the sheets in Photoshop, print them again, and draw those also.
A battery scientist’s trivial dilemma
You may find yourself hunting through all the batteries at the drugstore, trying to find an LR44 to buy instead of a 303/357. All because you want to be ‘faithful’ to MnO2. (By the way, this particular day you won’t find one.)
Functionally, these button cells are essentially interchangeable, but they have different active materials inside them. The LR44 is an “alkaline” battery which has the overall reaction:
- 3 MnO2 + 2 Zn = Mn3O4 + 2 ZnO
The 303/357 is a silver oxide battery having the overall reaction:
- Zn + Ag2O = 2 Ag + ZnO
They both give you a potential of about 1.5 V. Actually, the silver oxide battery voltage is a little higher, and its capacity is a bit bigger. But if you’ve been concentrating on MnO2 for a couple years in your work … you know … your loyalty might kick in.
Being a chemist, I’m more loyal to representing mixed oxides in the longhand format, MnO+Mn2O3. I don’t think the reaction in a battery is vigorous enough to produce “actual” Mn3O4. Is it common for battery scientist to use Mn3O4 over Mn2O3 as the product, I’m going to have to tear open a dead battery and check this on XRD.
It’s a good point. However, if the battery is discharged at a sufficiently slow rate (20 hours or slower) you do observe the well-formed spinel structure of Mn3O4. Opening the battery and using a standard XRD will result in a collection of products that are difficult to distinguish. By using a synchrotron beam to do diffraction through the battery without opening it, a good Mn3O4 structure is observed. The Clear Science staff will have a paper out about this soon … our preliminary paper on the technique is here.
We aren’t the first people to identify Mn3O4 as the slow-rate product. The Handbook of Batteries gives the same reaction as we have written above. (Wikipedia lists a different reaction, which is not well supported by the literature.)
Mary Poppins (Kristen Bell) calls B.S. on her unlivable wage.