Your feet is the most dependent part of your body; i.e. gravity tends to pull down the blood, and tend to pool in your feet. If you were to raise your feet above your heart level the veins would start to collapse.
Veins will appear blue. Don't confuse this with spider veins. They will often pop out on the hands and feet if you have been doing heavy lifting (hands and feet) or running or jumping a lot (feet). There is likely nothing wrong. If you don't like the blue veins around your breasts then get a tan.
Stay hydrated
yes they are and they can also pop too
If you didn't have veins, you couldn't have blood circulate through your feet and they would rot.
two feet
Veins help regulate your body temperature. When the body temperature is too warm, the veins will pop out. Veins will also be more prominent in those who have less body fat, and in the elderly because their skin is thin.
because your veins start to pop
Because their veins are more superficial or their skin is thinner.
Veins in the feet can appear more prominent due to factors such as genetics, age, excessive standing or walking, or dehydration. If you are concerned about the visibility of your veins, it is recommended to consult a healthcare professional to rule out any underlying medical conditions.
No
60 feet
Penises become hard by inflating the organ with blood. This means that when large the veins in the penis are visible in may cases.