One of the fading birthday helium balloons was at waist level, which, when you take in the fact that I am only a bit over five feet tall, is not very high. Another one was lying on the floor. It dawned on me that it was warmer outside and perhaps the balloons could rise a bit.
Then I thought that the helium and air would both be at the same temperature so the relationship should be the same. (I don’t know if that’s right or not.) However, I then considered that the sun might heat the foil which would transfer it to the helium and make it more energetic than the regular air molecules.
I really don’t know if that is what happened or not, but outside the waist-high balloon reached for the unreachable star (sorry, could not resist) and the floored balloon tried and tried and did finally reach the height of the house of across the street and disappeared from view. I could not bring myself to find out if it was caught under the eaves.