× Have a Question?
Get answers from Users and Local Businesses

What is the history of treadmills?

1 user answered

Jeshma Orusu, Hyderabad
User, Level 6 Contributor
At times an invented device may not be useful during it's initial stages but as time passes the utility of the device may become apparent or the device may be used for a very different purpose. One such device is treadmill, an important equipment of the modern day gym was actually used for punishing prisoners during the 1800s. Treadmills were invented in 1818 by an English engineer named Sir William Cubitt. Initial treadmills had a mechanism different from the present day treadmills, requiring the user to step upwards like walking up an endless staircase. 
The prisoners were made to turn a large paddlewheel by stepping on the spokes of the machine. Turning the wheel would in turn pump out water, crush grain, produce electricity, power ventilators in mines etc. Prisoners were often forced to spend up to six hours a day on the wheel in order to utilize their muscle power, to cure their idleness and to do useful work, this was equivalent of climbing about 5,000 to 14,000 feet. So the treadmill was used to torture and punish criminals. They remained in use to punish prisoners until the second half of the 19th century but later they were used to diagnose heart and lung disease in hospitals and  they gradually turned into exercise equipment. Treadmills today are used for various purposes like medical facilities (hospitals, rehabilitation centers, medical and physiotherapy clinics, institutes of higher education), sports clubs, Biomechanics Institute, orthopedic shoe shops, running shops, Olympic training centers, universities, fire-training centers, NASA, test facilities and training rooms of police and army, gyms and even home users. 

Show more

Do packaged drinking water have an expiry date?

1 user answered

Jeshma Orusu, Hyderabad
User, Level 6 Contributor
Water usually doesn’t have an expiry date but the plastic bottle that contains water has an expiry date so the plastic bottle will eventually expire and will leach chemicals into the drinking water as the bottles are usually made up of polyethylene terephthalate (PET) bottles and high-density polyethylene (HDPE) . The chemicals from the plastic bottle may or may not make the water toxic and harmful but it will definitely change the taste of the water. So, even if the water bottle expires it is still safe to consume the water if and only if the bottle isn’t opened and is properly sealed because the packaging keeps the dust, oxygen, microbes, high heat, pesticides, gasoline and other agents away from the water and thus preventing the water from being spoiled. Also storing the water for too long will change the bottled water’s appearance and smell along with the change in taste but the water will still be safe to consume. According to various food laws all the food products and consumable goods sold should have an expiration date and when Plastic or PET based water bottles are exposed to sunlight for a very long time algae or fungal depositions start taking place which is indicated by a light green tint on the bottle’s surface, water from such plastic containers shouldn’t be consumed. The average time of such micro-bacterial decomposition based on average storage conditions will give the expiry date that is to be displayed on the water bottle, therefore even though water doesn’t have an expiry date it is necessary to display an expiry date on the plastic bottle or contains. 



Show more

What are the facts related to blood?

1 user answered

Jeshma Orusu, Hyderabad
User, Level 6 Contributor
  •  Blood constitutes eight percent of the total body weight.

  • Mosquitoes usually prefer the blood type O

  • Spiders, lobsters and snails have blue colour blood. Earthworms and leeches have green blood. Starfish has clear or yellowish blood.

  • White blood cells constitute one percent of the total blood.

  • Blood also contains very few milligrammes of gold.

  • A red blood cell takes thirty seconds to travel the entire body.

  • -During pregnancy, the amount of blood in their body usually increases by fifty percent.

  • New borns have only one cup of blood in their entire body.

  • 1.3 million pints of donated blood is spoiled every year since blood only has a shelf life of forty days.

  • Pus is nothing but the dead white cells.

  • Cows have more than eight hundred blood types.

  • In humans, most familiar blood groups are O, A, B and AB.
Show more

What is digital X-ray?

1 user answered

Ram Kumar, Rajnandgaon
User, Level 9 Contributor
In an analog x-ray, a light sensitive film is exposed to the X-rays and followed by this, the film is developed. The digital X-ray has modernized this system and uses a digital detector system instead of the usual photographic light-sensitive film used in analog X-rays. So during the Xray session, the X-rays are directed to a particular part of the body so other parts of the body are not exposed to any radiation.

The digital detector system on opposite sides captures the incoming X-rays which varies in strength and converts them into electrical signals which are then shown on the computer. because there is no time needed for film development The  X-ray images can immediately be collected after the exam a compared t the traditional system.
Show more

When should I use a speaker stand for my speaker system?

1 user answered

Lalit Soni, Sagar
User, Level 8 Contributor
Midrange and treble sound frequencies are very directional. So in these cases, you will get the best sound if your ears are at the same height as that of the tweeter. There are floor standing speakers that can be used without speaker stands, but for small and medium size speakers, you would have to raise the stands to the ear level in order to get the best sound.
Show more

My son is 9 years old and in class 4.He wants to do some hobby course in computers. I have no idea what all are the options. Can you please guide me.He is quite creative

1 user answered

Khushboo Patel, Balco
User, Level 5 Contributor
I can relate to you cause I have a kid too :) You can start with Lightbot, which is an App in Android and introduces kids to complicated concepts in programming through simple and funny games. Post that you can let him try Scratch. After that he should be ready for full fledged coding.
Show more

Kya air gun buy karne ke liye licence lagta hai

1 user answered

Khushboo Patel, Balco
User, Level 5 Contributor
Yes, that is right. That started after 15 Jun this year when the Union home ministry brought into force Arms rule 2016 that also brings Air Guns under the ambit of license. More details in the link below.

http://www.hindustantimes.com/india-news/firearm-laws-get-tougher-even-airguns-need-permit/story-xSZayPM9elkEYnYx4VOh6L.html
Show more

What is 3D TV?

1 user answered

Lalit Soni, Sagar
User, Level 8 Contributor
They are TVs that can show videos that are made in 3D. To see these images, you will need to use 3D glasses depending upon the type of the TV screen. These glasses are at times also sold separately. There are two types of 3D screens called the Active screen and the Passive screen. These TVs display different versions fo an image for the left and the right eye.
These TVs though are not too popular nowadays due to the lack of 3D content available which is currently limited to just a few movies and games.
Show more

Which are the different Television Operating System out there in the market?

1 user answered

Narendra Sahu, Bangalore
User, Level 8 Contributor
Having an OS on a smart TV means that you can add apps, video chat, synchronise data and do even more which can be controlled using a remote control. Given below are the different Operating systems out there in the market currently. 
  • Android TV: These are Smart TV boxes which have Google cast built in. This is the same as the google chrome cast with which you can watch the favourite entertainment from the apps on a compatible television. 
  • Tizen OS: This OS is from Samsung and it searches for Samsung mobile devices nearby and allows content to be shared back and forth between the TV and the device. 
  • LG WebOS: From LG, this OS allows the user to simultaneously search for media that is stored in other external devices, watch a show, play a game and even browse the internet while searching or downloading a content.
Show more

What is a Smart TV?

1 user answered

Taran Luthra, Bilaspur
User, Level 8 Contributor
These TVs can connect to the internet and other smart devices. So they can display the content fro a tablet or a smartphone which you can view on a bigger screen. These TVs can use voice commands and hand gestures or even a mobile device or keyboard to control the TV. In addition, you can even stream online videos and even make video calls. Some of these TVs even have processors and RAM to play videos, run an app and browse the internet.

Show more

Trending
What are some French words and phrases commonly used in English language and what do they mean?
Ruchi Goel, Delhi
1. Déjà Vu
Literally means “Already seen”. It is used to describe that weird feeling of reliving the same past experien... [ See more ]