About the archaeology of the Bible

Excellent theologians throughout the centuries have trawled through the crevices and recesses of scripture and recorded their treasures.
Yet each one of us may look again and find some hidden gem or question, which has lain unearthed since first recorded and first laid down.
For example, these (and many others) have exercised my brain over the years -

• Why was Lazarus in the grave for 4 days? Is there some significance to 4 and not 3, as in the case of Jesus?
• Why did Jesus cause all those pigs to drown when they were the source of income for so many?
• Why did Jesus not just cast out the bad spirits? How can a bad spirit 'drown'?
• Why did Jesus curse the fig tree for having no fruit when it wasn't the season for fruit?