Tag: general knowledge

Bluetooth wireless technology was named after King Harald Bluetooth, a 10th-century Viking king of Denmark and Norway who united disparate Scandinavian tribes. The name was chosen to symbolize how Bluetooth technology unites different devices and communication protocols, just as Harald united kingdoms.

According to the Mahabharata, the Kauravas were 101 brothers in total - the 100 sons of Gandhari (born through the boon she received) plus their step-brother Duryodhana, making it 101. This is a well-known fact from the epic.

Lead-acid batteries, commonly used in automobiles and other applications, use sulfuric acid (H2SO4) as the electrolyte. This strong acid facilitates the chemical reactions between lead plates and lead dioxide plates, storing and releasing electrical energy through reversible electrochemical reactions.

Sachin Tendulkar became the first batsman to be given out by the third umpire using TV replays during the 1992 Test match between South Africa and India at Durban. The third umpire system was being trialed, and Sachin was adjudged run out after the on-field umpire referred the decision to the third umpire.

Irfan Pathan became the first bowler to take a hat-trick in the very first over of a Test match, achieving this feat against Pakistan at Karachi in 2006. He dismissed Salman Butt, Younis Khan, and Mohammad Yousuf on consecutive deliveries, creating cricketing history with this rare achievement at the start of the match.

Washing soda is chemically known as hydrated sodium carbonate (Na2CO3·10H2O), where 'hydrated' indicates it contains water molecules in its crystal structure. It's different from baking soda (sodium bicarbonate) and is commonly used for cleaning and laundry purposes.

A normal adult human body contains approximately 4.5 to 5.5 liters (about 5-6 quarts) of blood, which is roughly 7-8% of total body weight. This volume is essential for transporting oxygen, nutrients, hormones, and waste products throughout the body. Significant blood loss beyond 1-1.5 liters can be life-threatening.

In the Mahabharata, Shikhandi was originally Amba in a previous birth. After being rejected by Bhishma and taking a vow of revenge, Amba was reborn as Shikhandi, who eventually played a crucial role in Bhishma's death in the Kurukshetra war. This story highlights themes of destiny and reincarnation in the epic.

Douglas Engelbart invented the computer mouse at Stanford Research Institute in the 1960s. It revolutionized human-computer interaction by providing an intuitive pointing device. Webcam, graphics card, and sound card are important computer components but were invented by others at different times.