The crystallographic restriction theorem in its basic form was based on the observation that the rotational symmetries of a crystal are usually limited to 2-fold, 3-fold, 4-fold, and 6-fold. However, quasicrystals can occur with other diffraction pattern symmetries, such as 5-fold; these were not discovered until 1982 by Dan Shechtman.
these were not discovered until 1984 by Dan Shechtman OPTIONS:
- Yes
- It's impossible to say
- No
A: No

United States astronaut Sunita Williams, currently on board the International Space Station, has today broken the record for the longest unbroken space flight by a woman. At 5:47 a.m. UTC Williams passed the previous record of 188 days and four hours set by Shannon Lucid in 1996. This is not the only record Williams has broken. Earlier this year she set a record of 29 hours and 17 minutes for time spent by a woman on space walks.
Williams has spent almost thirty hours on space walks. OPTIONS:
- Yes
- It's impossible to say
- No
A: Yes

How to act in thailand<br>Avoid getting angry or raising your voice in public places. In thailand, the people are not confrontational. [substeps] Showing anger may embarrass a thai person and will not help you in your endeavors.
Thai people don't get angry in public places. OPTIONS:
- Yes
- It's impossible to say
- No
A:
It's impossible to say