We have all read of the 10 plagues that befell eygpt, but rather than god, can science provide us an answers.
The first one-"a river of blood", well rather than blood, just having the river's water turn red. Ok, what can do this, what if it had a toxic algal bloom of Physteria. This is red in color and will kill all the fish-takes oxygen out of the water and potions the ones left.
This leads us to the plague of frogs. With no or little fish in the river, the was no one to eat the tadpoles, so there would be a massive amount of frogs.
Before the frogs could leave the water, the would have had a lethal dose of the allege in them, this would cause them to die off very fast.
Because the frogs were dead, there were little predators to eat the insects-this could account for the plague of lice and flies.
Boils on cattle and man-this could have been a sickness carried by the masses of flies that lived-dirty little things.
A massive hailstorm could have destroyed the crops.
Locus-well, that plague has been around for a long time and still hits today.
A massive sandstorm-it happens in the desert, enough so to have a name cashimh.
As for the first born, all the left grain would have been harvest wet and with locus droppings and stored in the heat-perfect growing conditions for bacteria. Realizing the "upper" classes in egypt ate first and the first born were given extra servings-being the most important. They would have gotten the grain on the top-most likely to have the most bacteria present.
There are other things we have proven scientifically.
We have discovered a bush which produces methane. Now if someone walking along kicked a rock and it hit another rock and sparked-we have our burning bush.
.