I'd say:
a letter
a picture
a toy
a pencil
a book/page of a book
a coin/note
your favourite things
a letter to the future about anything you want
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Some good items to put into a time capsule include newspapers or magazines from the current period, letters or notes from participants, photographs or drawings, a current coin or currency, a popular music album or movie, and predictions or messages for the future generations.
The Apollo 11 flotation bags were used to help stabilize and keep the command module afloat after its splashdown in the ocean upon returning from the mission to the Moon. They helped ensure the safe recovery of the astronauts and the spacecraft.
Helium gas, confetti, small toys, or water are common items that can be put inside balloons for various occasions and decorations.
You can put small colorful objects like beads, buttons, or pieces of glass in a kaleidoscope to create interesting patterns and designs when viewed through the scope. These items should be lightweight and reflective to help create the kaleidoscopic effect.
Good points: Sundials are environmentally friendly, do not require any power source, and can be an aesthetically pleasing addition to a garden or outdoor space. Bad points: Sundials are not accurate during overcast or cloudy weather, do not work at night, and can be affected by changes in latitude and daylight savings time.
No. This was demonstrated during the Apollo program when the capsule moved around to the dark side and NASA lost contact briefly. Radio contact requires line of sight, or some means of reflective transmission such as satellite to satellite to move it around obstructions in orbit. Simply put.