How did Alfred Noble invent dynamite?

Application of void data type in c plus plus programming language? What happens if a circuit has no resistance? What does the word engineer mean? What is the use of inter integrated circuit protocal? Distinguish between primary memory and auxiliary memory? A sentence with the word exploded? How has mass media changed since the 1950s? In a series rl circuit when XL increases and r remains the same z will? What is a descriptive software process model? How can Hydrogen be used to power a car? What is the test pressure for 4 PVC piping? Why purging required for stainless welding? What keyword is used to declare a named constant? Is 'Sonic the Hedegehog' an American creation or not? What is a good robot name? When can an analog signal be reconstructed from its sample values? In what country was technology invented? What is threats to development? What end is the cathode end of xray tube? What is meant by degree of subcooling?