Which macronutrient is the body's primary and most efficient source of quick energy?

Which blood type is known as the universal donor for blood transfusions?

Which type of mirror is commonly used in vehicle side mirrors to provide a wider field of view?

Which scientist is credited with developing the first successful smallpox vaccine?

Which natural phenomenon results from the dispersion of sunlight through water droplets in the atmosphere?

Which type of energy is stored in the chemical bonds of food and fuels?