... In Arithmetic, 1+1 = 2, in Computer Science, 1+1 = 0, but in Love, 1+1 = 1!

 

00          None/Never         Number 0         Number 0 in Math. 

[...<0]  * [0<...<1]  * Number 1/21 & Only 1 *  Odd & Even * Misc. * First & Last  

 

[Astronomy] The number of natural satellites (moons) of the planets Mercury and Venus.

 

[Biology]  Cat is the only domestic animal not mentioned in the Holy Bible.

 

[Calendar]  There is no year designated as year 0, for conventional calendar, (except for astronomy purposes): after the year 1 B.C. is the year 1 A.D. Legends: B.C. = Before Christ or, similarly, B.C.E. = Before Common Era. A.D. = Anno Domini (Year of Lord, in Latin) or, similarly, C.E. = Common Era.

 

[Geology]  Antarctica is the only continent that has no country; many countries establish science stations here, but own no land.

 

[Geology]  No country name (English) starting with letter X.

It is the only letter without starting a country name (English).

 

[Geology]  The state of Delaware has no unit of National Park System, such as national parks, seashores, historic sites, battlefields, memorials and monuments.

 

[Geology]  There is no major river in Saudi Arabia.

 

[Math.]   There is no 7-digit prime number whose digits are consecutive (including digit 0).

There is no 9-digit prime number whose digits are consecutive (including digit 0).

 

[Math.]  There is no 9-digit prime number that includes all 9 different digits from 1 to 9, in any order.

 

[Math.]  There is no 10-digit prime number that includes all 10 different digits from 0 to 9, in any order.

 

[Math.]  No prime number consisting of only repeated digits other than repeated digit 1’s. E.g., number 11 is a prime number.

 

[Science]  Nobel prize has been never awarded posthumously.

 

[Sport]  No country in Southern hemisphere hosted a winter Olympic Games.

The first city in Southern hemisphere hosted a summer Olympic Games is Melbourne.

 

[Tech.]  There is no channel 1 on TV set dial knob and TV program, since in the 1940s, FCC assigned that channel to mobile services (e.g., two-way radios in taxicabs), but did not re-number the other channel assignments

 

[Trivia]  There are two types of fools: those who trust everyone and those who trust no one.