Would 1996 leap year baby technically be 1 year old in 2000?
A leap year happens once every 4 years and has 29 days in February. The years 1996, 2000, 2004, 2008, 2012, 2016, and 2020 are the last 7 leap years that have happened. 1996 to 2000 is one leap year.
The answer is yes.

Does Lupita Nyongo have citizenship in paternal Family of Barack Obama's origin country?
Actress Lupita Nyongo has dual citizenship in Kenya and Mexico. Barack Obama's father was born in Nyang’oma Kogelo, Rachuonyo District, Kenya Colony. Barack Obama's father was a Kenyan of the Luo tribe.
The answer is yes.

Does Home Depot sell item in late September zodiac sign symbol?
The zodiac sign for late September is Libra. The Libra zodiac sign is represented by scales. Home Depot sells a number of scales including Pelouze and Ozeri brands.
The answer is yes.

Does the density of helium cause voices to sound deeper?

Helium is less dense than air. Sound travels more quickly through helium than it does through air. When sound travels more quickly, the tone of it raises and sounds higher.
The answer is no.