Belfast city centre is divided into two postcode districts, BT1 for the area lying north of the City Hall, and BT2 for the area to its south. The industrial estate and docklands BT3. The rest of the Belfast post town is divided in a broadly clockwise system from BT3 in the north-east...
The official definition and origin of the name as promoted by Panama's Ministry of Education is the "abundance of fish, trees and butterflies". This is the usual description given in social studies textbooks. At the time of the arrival of the Spanish in the 16th century, the known inhabitan...
For a long time, bivalves were thought to be better adapted to aquatic life than brachiopods were, outcompeting and relegating them to minor niches in later ages. These two taxa appeared in textbooks as an example of replacement by competition. Evidence given for this included the fact that b...
Some textbooks use Newton's second law as a definition of force,[12][13][14] but this has been disparaged in other textbooks.[3]: 12–1 [4]: 59 Notable physicists, philosophers and mathematicians who have sought a more explicit definition of the concept of force include Ernst...