4to40.com

What is a boomburb?

A boomburb is a booming suburb or satellite townships dreamt up by developers. It gives an idea of wealth, a boom. Boomburg is a similar term. These suburbs are usually not complete towns – though they are self-sufficient. Learn More Boomburb is a neologism for a large, rapidly growing city that remains essentially suburban in character even as it reaches …

Read More »

What is a banana bond?

A chemical bond is the phenomenon of chemical species like atoms held together by electrostatic or electronic forces. Of the several types of chemical bonds, a special type exists in the molecule of boron hydride BH3 which exists as a dimer B2H6 molecule. It contains two types of hydrogen atoms. Four hydrogen atoms are of one type, which are used …

Read More »

What is a ‘nano-factory’?

Researchers in Japan have invented a tiny brain which can act as a remote control for swarms of nanomachines. They simultated eight such nano-machines to create a ‘nano factory’. Experts say nanomachines could be used to boost the processing power of future computers. They also hope nano-machines can treat diseases. The machine is made from 17 molecules of the chemical …

Read More »

What is a ‘tester’?

A ‘tester’ is a canopy over a bed, which is supported on the pots of the bedstead or suspended from the ceiling. Formerly the word was used to described the vertical post at the head of the bed which rose to, and sometimes supported the canopy or the framework on which the canopy and curtains rested. The term ‘testour’ occurs …

Read More »

What is a ‘motte and bailey’ castle?

A simple fortification consisted of two parts: a natural or artificial mound (motte) with a wooden tower or keep on top, and a larger area at the foot of the mound enclosed by palisades, (and later by walls and towers of masonry), called a bailey. The bailey was used for stores and huts. This outer walled space sometimes had a …

Read More »

What is a ‘longship’?

From about A.D. 800 the Norse sailors raided the coasts of northwest Europe, and the craft they used were the broad and shallow ‘longships’. The Vikings, as the Norsemen are commonly called today, set out from their creeks or fiords in Scandinavia and Denmark in early spring and late summer, and sailed away on long, bold searches for plunder. These …

Read More »

What is 4-D cinema?

What we see today are two-dimensional movies with multi-channel sound. In three-dimensional movies, viewers are required to wear special glasses which creates 3-D images of objects. ‘Chhota Chetan’ and ‘Shiva Ka Insaaf’ were such movies released two decades ago. Fourth dimension in a movie creates a different experience. Besides the 3-D effects, viewers can experience the movie through other senses …

Read More »