Why don't we feel bitter taste at front part of the tongue?

Which two tastes can be detected by the front part of the tongue?

Taste buids for bitter taste are found on tongue at

Why don't we observe the wave properties of large objects such as a cricket hall or an neroplane ?

If electromagnetic radiation is made up of quanta, why don't we detect the discrete packets of energy, for example, when we listen to a radio?

The drift speed is defined as v_(d)=(Delta l//Delta t) where (Delta l)is the distance drifted in a long time (Delta t). Why don't we define the drift speed as the limit of (Delta l//Delta t) as (Delta t (rarr)0)?

Why don't two magnetic field lines intersect each other?

Taste papillae of bitter taste are located in anterior/posterior part of tongue.