english: Could we get balloons the size of a house to stay up for more than 100 days, while costing less than five percent of what traditional, long-life balloons have cost to make?
non_english: Konden we huizenhoge ballonnen  meer dan 100 dagen in de lucht houden, terwijl de kosten minder  dan vijf procent bedroegen van die van traditionele ballonnen  met lange levensduur?