Two organs difficult to repair using stem cells

Apical meristem and the lateral. The heart, brain, bone marrow and the Lungs in adults are difficult to repair using stem cells.

Explanation:

There are two kinds of stem cells: embryonic stem cells and adult stem cells. Adults also have stem cells in the heart, brain, bone marrow, lungs, and other organs. They are our built-in replacement tools, restoring cells infected by infection, trauma and everyday erosion, and cut. Adult stem cells are extremely difficult for specialists to operate because they are extra challenging to derive and culture than their immature complements.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt