The video is a little more than an hour long, but sooooooooooo worth watching!
Science Tests Faith [1:05:38]
One of the miracles the speaker discusses in the video is of a consecrated host in Buenos Aires, Argentina, that began to bleed. It begins at 15:30 on the video. In the liquid, scientists found human flesh and blood. This confirms the Catholic teaching that the Body and Blood of Our Lord is present in BOTH the consecrated bread and consecrated wine.
“Christ Jesus, our Lord and Savior, is wholly present under the appearance either of bread or of wine in the Eucharist. Furthermore, Christ is wholly present in any fragment of the consecrated Host or in any drop of the Precious Blood. Nevertheless, it is especially fitting to receive Christ in both forms during the celebration of the Eucharist. This allows the Eucharist to appear more perfectly as a banquet, a banquet that is a foretaste of the banquet that will be celebrated with Christ at the end of time when the Kingdom of God is established in its fullness (cf. Eucharisticum Mysterium, no. 32).”
The Real Presence of Jesus Christ in the Sacrament of the Eucharist: Basic Questions and Answers