Ancient astronaut theorist Nutter B. Butter claims that the Caloprians from planet Calop, 30 light years away and at rest with respect to the Earth, wiped out the dinosaurs. The iridium layer in the crust, he claims, indicates spaceships with the fuel necessary to travel at 30% of the speed of light here and back, and that their engines allowed them to instantaneously hop to this speed. He also says that Caloprians can only reproduce on their home planet. Call the minimum life span, in years, of a Caloprian, assuming some had to reach Earth to wipe out the dinosaurs, $T$. Assume that, once a Caloprian reaches Earth, they instantaneously wipe out the dinosaurs. Then, $T$ can be expressed in the form $m\sqrt{n}$, where $n$ is not divisible by the square of a prime. Find $m+n$. 

[i](B. Dejean, 6 points)[/i]
1. **Understanding the problem**: We need to determine the minimum lifespan \( T \) of a Caloprian, given that they travel from planet Calop to Earth and back at 30% of the speed of light. The distance between Calop and Earth is 30 light years. We need to account for time dilation due to their high-speed travel.

2. **Time dilation formula**: The time dilation effect in special relativity is given by:
   \[
   \Delta \tau = \Delta t \sqrt{1 - \frac{v^2}{c^2}}
   \]
   where:
   - \(\Delta \tau\) is the proper time experienced by the traveling Caloprian.
   - \(\Delta t\) is the time experienced by an observer at rest (on Earth).
   - \(v\) is the velocity of the spaceship.
   - \(c\) is the speed of light.

3. **Calculate Earth time for the journey**: The spaceship travels at 30% of the speed of light (\(v = 0.3c\)). The distance to Earth is 30 light years. The time taken for a one-way trip from Calop to Earth, as observed from Earth, is:
   \[
   \Delta t_{\text{one-way}} = \frac{\text{distance}}{\text{speed}} = \frac{30 \text{ light years}}{0.3c} = 100 \text{ years}
   \]
   Therefore, the round trip time is:
   \[
   \Delta t = 2 \times 100 \text{ years} = 200 \text{ years}
   \]

4. **Calculate the proper time experienced by the Caloprian**: Using the time dilation formula:
   \[
   \Delta \tau = \Delta t \sqrt{1 - \frac{v^2}{c^2}}
   \]
   Substituting the values:
   \[
   \Delta \tau = 200 \sqrt{1 - \left(\frac{0.3c}{c}\right)^2} = 200 \sqrt{1 - 0.09} = 200 \sqrt{0.91}
   \]

5. **Simplify the expression**: 
   \[
   \Delta \tau = 200 \sqrt{0.91} = 200 \times \frac{\sqrt{91}}{10} = 20 \sqrt{91}
   \]

6. **Express \( T \) in the form \( m\sqrt{n} \)**: Here, \( T = 20 \sqrt{91} \). Thus, \( m = 20 \) and \( n = 91 \).

7. **Calculate \( m + n \)**:
   \[
   m + n = 20 + 91 = 111
   \]

The final answer is \( \boxed{111} \)